Malicious PDF — malware analysis report

Static analysis result for SHA-256 977665d33b5a0f67…

MALICIOUS

PDF

79.8 KB Created: 2021-04-08 06:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f0cc9aa12f7b722c0d35368575c195b5 SHA-1: c3fab98c1523f7177aa5099b6f05f34125aa3e87 SHA-256: 977665d33b5a0f675ad1ca69f2c6a2f3eb0c0a6f9da9eb22b622d96ab654021f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document body's deceptive search query indicate a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=is+logitech+m325+compatible+with+windows+10 PDF link annotation
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/8604247.pdfIn PDF document text
    • https://fomuropuzukamu.weebly.com/uploads/1/3/4/7/134728801/jukakepulegif.pdfIn PDF document text
    • https://cdn.sqhk.co/nudofarus/Nghd8ih/vazatinif.pdfIn PDF document text
    • https://nezasofesaz.weebly.com/uploads/1/3/5/9/135961661/sojawux.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/uhhhb56/wifidu.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/jiaie1R/dragon_ball_z_super_goku_battle_hack.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/470937.pdfIn PDF document text
    • http://zarepaputome.iblogger.org/55739656221.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/1977916.pdfIn PDF document text
    • https://powonevupurig.weebly.com/uploads/1/3/4/7/134704952/mufunavano.pdfIn PDF document text
    • https://bobelijanufav.weebly.com/uploads/1/3/5/9/135960041/duxuwegu_gegakariwi_kafutob_ditotepexodadod.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/bae2f252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://janalusexisowa.epizy.com/dejawejijufati.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/83614084145.pdfIn PDF document text
    • http://besogigususatu.epizy.com/18636259790.pdfIn PDF document text
    • http://xukonepuwe.rf.gd/articulo_123_constitucional.pdfIn PDF document text
    • http://ritebononopa.epizy.com/online_editor_with_ocr.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/mozifolez.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5964 bytes
SHA-256: 7da624c11b2c178d76440fbb9a972524419e6368c2eeef199abef986f1678413
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10800 bytes
SHA-256: 8b2e07d3e46ecf4eaf2ab7964f5feed6542ef06bfbc599e6a1c59e412ddcf42f
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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