Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e86cd51c93fc96…

MALICIOUS

PDF

86.1 KB Created: 2021-03-14 12:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1166038f33c91893eb9fbe38794af279 SHA-1: 9b097a0d31f3f9250357e8ea6567bfd4b66fcfe1 SHA-256: 83e86cd51c93fc96bea99156838e368613e9eafce1c8d82e951902a52ef4f01f
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a significant number of external links, with heuristics indicating a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of numerous URLs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/123?utm_term=labeling+plant+and+animal+cells+worksheet PDF link annotation
    • https://cdn.sqhk.co/voxobidivel/hajbifQ/t_mobile_prepaid_plans_25.pdfIn PDF document text
    • http://matanusebatug.22web.org/super_bass_portable_speaker_manual_em_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/fhgggDG/fixusupidos.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/ihgiejb/vetomibaxodalutodijaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/ghKjihd/brad_s_deals_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/3ibNgdL/soul_plane_flight_attendant_cast.pdfIn PDF document text
    • http://fotodosajube.22web.org/mikok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7b850d-ef53-4fbc-8564-a7360599e919/necromunda_underhive_wars_ps4_dlc.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_c71957fff3dd4fffbd031e862b0ba6ac.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_3a00b4a478214a83a5e5ac94fa1bcb57.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_99b6c23727db457e82406fc07542ada4.pdf?index=trueIn PDF document text
    • http://gezibetaw.epizy.com/zezonidolodupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1771f07-e08d-4b1c-99c0-c1292271a8ed/gaxumetuwexeze.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e175c428979f4f5eac2ea568a2f501aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd238b8-6ef6-4b95-9cc3-3af58cbe89d0/rafajumasitatunujidolok.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_3c321c6b00ed4e5d8f3b7666e4fcafac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed908879-dc67-4bc9-8a8c-56f7fae4dfe1/baby_bird_screaming_meme_twitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d034ce3e-48cb-49cf-9bcf-793c3152bf44/fawamupurubapebonupul.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_2751d27727df46ee9b2f364756a253af.pdf?index=trueIn PDF document text
    • http://pegivaruxonozef.rf.gd/sudobur.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_751d797cf71744cc99b8983241a57d13.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_3304abcd627d476a8fbb26bc76662245.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 5724 bytes
SHA-256: 2ea0cde2a33d54dbf43aa1b218cb56ff948125cd153c685a1aa8df928fa7598e
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 11224 bytes
SHA-256: 6f7816ca438e8809ee395645d24289a9844242737742bee710c54cff1f1d4137

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