Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048b91a7d639385…

MALICIOUS

PDF

71.7 KB Created: 2021-03-03 14:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4fdc8444f815187b8b5cc11083cbbce0 SHA-1: 75967314a77143aff05a920f6f3d4b76dbcae6d5 SHA-256: 8048b91a7d639385d3b926e51a2fd0f4a2d377b5aa7d1777e6d9d19634afba93
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=describe+a+tree+as+a+person PDF link annotation
    • http://reduslimitalia-official.site/what_is_the_9th_multiple_intelligenceo6nxw.pdfIn PDF document text
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/menubiwuloturer.pdfIn PDF document text
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/09bf7e768.pdfIn PDF document text
    • http://cryogen.me/atheros_ar9271_linux_driverd4d9e.pdfIn PDF document text
    • http://topsale.pro/wizapebimupufonipitixej1yp9m.pdfIn PDF document text
    • http://forsage.pw/what_is_the_importance_of_teaching_social_studiesqocc4.pdfIn PDF document text
    • http://awpmode.com/6862636655jwbv4.pdfIn PDF document text
    • http://fegudifo.22web.org/whats_cloud_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/9MQhi8X/american_express_balance_transfer_phone_number.pdfIn PDF document text
    • http://wejixekolubuguw.iblogger.org/11819273345.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/cSiejie/tuvotorukudavopodurawevu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwetigimibe.epizy.com/how_the_grinch_stole_christmas_book_illustrations.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/costo_de_boletin_informativo_sunarp.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/astrill_vpn_iphone.pdfIn PDF document text
    • http://lozopavo.rf.gd/rogajevipodowa.pdfIn PDF document text
    • http://ruxomipeb.epizy.com/85635410886.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5036 bytes
SHA-256: 0e7ed7cd3535195e656acb600f41a1e41f55e04851990f61d592b2bc0e217f32
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 9848 bytes
SHA-256: 190806ad5ebea42a815c19fbce3638d253b13f29dd5f9b41955c2ff57e854e8d

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