Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c172173004fb66a…

MALICIOUS

PDF

100.7 KB Created: 2021-06-06 12:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 86a327f8976a251db928970d4fb122c3 SHA-1: bb54b497ff69715a737ff8cc6a8d263887a6d387 SHA-256: 6c172173004fb66a083f2afe54e9dc43f865c20046f7002e4aa64c62e7f44ee5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a URL with a 'utm_term' parameter further supports a phishing or malicious redirection scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/pbw?utm_term=maybe+interactive+stories+mod+apk+sbenny PDF link annotation
    • https://vewirorerisemi.weebly.com/uploads/1/3/4/6/134627211/faveb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_60469e82e3ec4.pdfIn PDF document text
    • https://takisulajedeviv.weebly.com/uploads/1/3/7/5/137501155/3723874.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/fokovaji-norobak.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417827/normal_60b6b44589eab.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/dekaninijuwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_60049606c2406.pdfIn PDF document text
    • https://zuginapox.weebly.com/uploads/1/3/2/6/132695273/3864644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d85640-0c13-4822-b3df-01c0be4f3219/kidde_kn-cosm-ibaca_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df912461-05be-4975-948d-8c4ccd6b601d/tavexof.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/wivuzebanaluta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b43701a-03ff-4535-9a96-9f5839ed63c5/pizusowibobeluboluturet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80523c4a-5535-410a-ac72-8350b644bbb5/the_betrayed_kiera_cass_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8976743c-11b1-4c96-b9e4-a71e080f67f8/zelda_ocarina_of_time_hd_demo_unreal_engine_4_download_link.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/41169320715.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144571188/47863135368.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144678441/using_ultrasonic_distance_sensor_hc-sr04_with_lcd_display_and_arduino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38080ee-c62e-4f91-9166-f55cc93f1477/wapizomukafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714e4e3a-ca09-4105-b800-da5dda218840/maus_summary_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec9d5a1-5e66-49f4-a25d-7be7cc6060af/the_silence_of_the_lambs_thomas_harris_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2a711d-c3f2-4ba8-87a8-6b9586209706/69474418134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fe5a0f-707d-4ce9-ab9c-686b4cdfc3f0/what_does_yo_te_amo_demasiado_mean_in_english.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 6740 bytes
SHA-256: 63918f0495d5863976c8752c90d95c56f1c073747ef567a031544105186753d7
font_01_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 5556 bytes
SHA-256: 73a0614a82027a58dda94cfff35fab7b301a6763af3fe07ca16adab59e34364c
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 12128 bytes
SHA-256: f6165837061c623b768b22231b6b943e878da654b85b77753c954c896f2df46e
font_03_sfnt_off00015ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF4 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_04_sfnt_off00017498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17498 4028 bytes
SHA-256: 30c08bc2a93f51dff5f8225074eec090166206a30b9da3f18357373277e20792

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