Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25cf3382966bf48…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 11:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 65e2b3a29bccb3c8581ce828ae060a00 SHA-1: 5081777e9ab46b510069bf60b4a5bb1b901d82b7 SHA-256: b25cf3382966bf48b9f83737ac158eaeccbc1bc74a9f59397a3092baaf6623a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=la+historia+no+contada+de+estados+unidos+capitulo+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcef548454d1.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/4796332.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/8673142.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/iHrQHid/black_screen_windows_10_2004.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/WifQwAA/70827441680.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/zutakederigezikera.pdfIn PDF document text
    • https://sajakuzotile.weebly.com/uploads/1/3/1/0/131071181/8db85c50fb19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601c8713b5b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_6013393adcb09.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/gAjbSjb/impossible_water_bottle_flip_game.pdfIn PDF document text
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/befexulefijebek-lopagixofawu.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/wuzorebafuwaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601cdf12d94b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_60288a7a268fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94952a9bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5ff2a96b7c62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_60215a1edb10c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9e324e0f1.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/8663326326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5296 bytes
SHA-256: 8f55abf696e6cf98e343535c2c75dbc2709e88b632566083794dc73ccefdcc00
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10924 bytes
SHA-256: 5d790043ff431a6b28ccc0053f51801ba79a4b564ef208eaebe5b9c53e764809

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