Malicious PDF — malware analysis report

Static analysis result for SHA-256 057cbdc9795f6e74…

MALICIOUS

PDF

88.9 KB Created: 2021-02-14 20:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fdd71a29f5d46f083e9ba98efd361d74 SHA-1: 85e7c9545397c78a705427e03e322ee239b32eb6 SHA-256: 057cbdc9795f6e74f73bff0e74cc43796feaaca6ee7a2c76960f510bf61d5e81
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful content.

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://jottigo.ru/wix?keyword=pokemon+3ds+randomizer+rom+download PDF link annotation
    • http://bcpzonasegurape2-viabcp.com/8412991964b1dq8.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/jZJynia/harvard_business_manager_fur_studenten.pdfIn PDF document text
    • https://latiniwujuxemuw.weebly.com/uploads/1/3/3/9/133997677/1645776.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/qjePrgd/724_credit_score_car_loan.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/jfgdgcy/45496040303.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/V5jeVf4/54929529320.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/cbc_gem_android_apk.pdfIn PDF document text
    • http://urro-hu.com/lego_technic_idea_book_wheeled_wonders2z5vt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesogopobatobop.epizy.com/wareralefopipujawazupud.pdfIn PDF document text
    • http://xepesufotereri.rf.gd/dryer_sheets_ok_for_baby.pdfIn PDF document text
    • http://bupozefi.epizy.com/djia_cnn_stock_report.pdfIn PDF document text
    • http://kokexaxuseru.epizy.com/psychedelica_of_the_ashen_hawk_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 4032 bytes
SHA-256: da2f2be5d9edd17cdfc0b4f948dd3bf442bd6cb2d85fbba54de746be6167ce52
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 5344 bytes
SHA-256: 73909c8fc1995b5e4f237838329ee0a7cfc3d8a8fd94999ea012d29569c2accb
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10504 bytes
SHA-256: 7d9833624b230841773f8866693aa2cbe8583490c67a95f37d697a50401477ad
font_03_sfnt_off000140e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E5 16104 bytes
SHA-256: 605ad279f7722c984db8ebcf7bf0e75db4909a57927d1f30457e850443e0414e

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