Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a62b962a1b463…

MALICIOUS

PDF

69.5 KB Created: 2021-02-25 08:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3985e2610c393c25cba7c7ecd40b12cc SHA-1: 9f7bbc8b593977631a1d56bff9161526a91e7735 SHA-256: 139a62b962a1b4632121bddf9648d8297426f33617246233ec452a9d35e3a30b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links to disposable domains suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and link farm behavior point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=resumen+capitulos+sapo+y+sepo+son+amigos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_601b65d932bff.pdfIn PDF document text
    • http://teenagetutor.online/riddle_in_hindi_with_answersl6xax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6017ced7119c4.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/ghqPHG5/26917398038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fecfdfacca94.pdfIn PDF document text
    • http://1freedom.space/how_to_make_a_persuasive_conclusion8edlv.pdfIn PDF document text
    • http://flymoney.net/617805062323d4dc.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/romigutenezuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/1ib27lK/gumball_watterson_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/filovosa/ejcthEV/harvard_business_review_costco.pdfIn PDF document text
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/sakanelalopizaw.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/6963867.pdfIn PDF document text
    • https://xuzimelo.weebly.com/uploads/1/3/4/1/134132070/sobitobadugubidutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5268 bytes
SHA-256: a037067d62ea7878f53f182e8934e8049c4603c5e789a7ff45ce11be5c31134f
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 11800 bytes
SHA-256: 57fad05e8da5729992f6fa573ef595a222f5a9395acaa3657f30399e2a39b5ff

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