Malicious PDF — malware analysis report

Static analysis result for SHA-256 67577163f40a2843…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 01:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 007e11c5ac7d641f9c065f6830bc856e SHA-1: 82920a6ce1040169716f1e594e7acf663107465b SHA-256: 67577163f40a2843d2c7b7aecb16507a0392872d82062e07719a14251238bc11
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to manipulate search engine results or host malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=what+is+kiln+wash+used+for PDF link annotation
    • https://cdn.sqhk.co/nisugewameru/3gfgfIc/clayface_boss_fight_arkham_city.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/tjcgfvS/cooking_fever_cheats_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kasunelebak/pjirI4Y/from_the_sea_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/hdRjcvY/dark_side_of_the_moon_album_cover_tattoo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/hahfji3/labodaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/hbVchgt/2867404907.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/fWyYUJt/pdf_document_scanner_premium_4._25._0._0.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/igUjhgg/78649823126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_00471f048e2c4bfbb93616bd3e51695c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b503aff0-4e3a-46d8-bae7-1353458f80dd/zurunopinekikobuluwirew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba52ed2-5e7c-44e7-8145-2822e290e746/15401703994.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_1bc79310c82147ee8e6944c0b926a880.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c07747-8ccf-4383-bdb3-9219307dd5d0/8695656038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2831a92-6831-4f92-8ae2-ac262f0fd59b/bidevedosop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960b72ad-f2f2-44a8-a903-1d4913744e72/que_es_la_biblia_cristiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158238ff-b773-40ad-bd31-d758e4436caa/2012_jeep_grand_cherokee_headlight_bulbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d14cef-75ce-47f5-9687-34b92a2f4075/siliwubalawaxokimuvozoro.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_53dd790fcaf24302a62f5638410ff216.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_3dcfcbd2f3494617a72a2283c404ba95.pdf?index=trueIn PDF document text
    • https://4dd62b93-bb0f-494d-9363-2046eec350ea.filesusr.com/ugd/e54fc7_51a5aa9055d44cdc8af136bbba9cf7d6.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_b501722115ad4ef698c496b9a09ad9bc.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 5164 bytes
SHA-256: 494bb252263275405085c1d8b31a3bdfb575021e478d76ba6cb71aa8459727c5
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 10580 bytes
SHA-256: e26da9636fe423e4976d1afb290e4cd42f32671e8b60a15d6ca5d5915477d964
font_02_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 16232 bytes
SHA-256: 518caaef23ff38dffd173390deb2ebbf4fc7588f1930709da0bf1b0df588cfea

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