Malicious PDF — malware analysis report

Static analysis result for SHA-256 b978727dd57fcd43…

MALICIOUS

PDF

76.9 KB Created: 2021-02-04 23:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73f9d42a089f261101717c1c74b65967 SHA-1: 3d726fec77c19fc58ff3b5a0387dd9e43c9ee914 SHA-256: b978727dd57fcd43670282434ed3aec7858aaf498330e1ff61d79734eb5d8120
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 or using URL shorteners, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a common tactic of redirecting users to malicious 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://seumenha.ru/123?utm_term=descriptive+text+structure+anchor+chart PDF link annotation
    • https://cdn.sqhk.co/metexemoraga/bheDcgs/36412154871.pdfIn PDF document text
    • https://wapixanap.weebly.com/uploads/1/3/1/1/131164574/e8485bbf2e6.pdfIn PDF document text
    • https://vetenejoxo.weebly.com/uploads/1/3/1/3/131379321/1e8990.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/hijidX4/tumblr_frases_de_amor_em_ingles_com_traducao.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/igbgije/bamukovewafovajomobobajaw.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/donutefobudimam.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/epAtqhj/powered_subwoofer_bass_tube.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/gesitukavuliruf.pdfIn PDF document text
    • https://cdn.sqhk.co/silijebutu/hfOnehg/archery_mule_deer_hunting_arizona.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/sobeguwax-rugogafaw-dosim.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/gifjcwm/translate_english_to_russian_letters.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/4d429ca7404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/diabound_kernel_form_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/tibumugenevufasuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/carers_allowance_form_under_16_years.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/coliforme_bakterien_im_trinkwasser.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5116 bytes
SHA-256: cb395fa6f6ad99a2ab2b462c5f978bdd9fad4fd998341203284f2963ee3c3fd9
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 10632 bytes
SHA-256: 9c79996ab12cc9a781a6a00ce34e6a3600df7794af5f50457ebfb5750f8735c6

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