Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f884800c7b43999…

MALICIOUS

PDF

69.3 KB Created: 2021-02-24 09:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5c22ecdceeb9735c2627df7a7f05f79e SHA-1: bcc2d41fe6903d850f2da26365b8b95eeb894c4b SHA-256: 3f884800c7b43999ab458dc46a825e1aa6568c1387c758e0f6abb74a2149a86e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, including a link farm and an SEO redirector, suggesting it's designed to drive traffic to potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=traductor+castellano+lat%25C3%25ADn+online PDF link annotation
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/feloxobokegisiz.pdfIn PDF document text
    • http://mklhhhh.space/lixirebepesutinabewpf57.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/5235674.pdfIn PDF document text
    • http://osthondroz.com/followtok_free_fans_and_followers_for_tik_tokn9mmj.pdfIn PDF document text
    • http://small-italy.space/eldest_inheritance_book_2pr3op.pdfIn PDF document text
    • http://all-system7.work/76366600533qes89.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/lerirumewikodemiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5fedd54a245f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5ffa5b4adaec6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5fe2a584a4839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fef71374e86d.pdfIn PDF document text
    • http://kernig.online/nike_brand_guidelines_20193nzvt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489056/normal_5feb85f6e68e5.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/1469017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_60226cc6a6167.pdfIn PDF document text
    • http://creditscoreusa.info/285343310104lu2q.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/be3efc420a95.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

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_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 4936 bytes
SHA-256: 6f4dd3331101e8ee60cdd4d7b058c74282cb82034735069637e8c6b8bf13737f
font_01_sfnt_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 11728 bytes
SHA-256: 2a58ab70bf3f244ca829c3479c937169cd53d844b47c3376f2324efaf1dd5e20

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