Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27335f44e51b332…

MALICIOUS

PDF

65.7 KB Created: 2021-02-15 08:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7cc962cec4f6e38e9d166cfb2579a887 SHA-1: 97f41e65455a4dd8f9d3c12a73aa398039ca8d1a SHA-256: b27335f44e51b3329d870fa2e55cb053d90c15d972823a9a57b6f123fd51bb76
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123'. This, combined with ClamAV detection and an ML classifier flagging the PDF as malicious, strongly indicates a phishing or malware distribution attempt. Although no scripts were extracted, the presence of embedded URLs and the nature of the redirector suggest the document's primary purpose is to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=southview+elementary+school+apple+valley+minnesota In PDF document text
    • http://medway24.com/cerebral_cavernous_malformation_surgery_risks4dmrh.pdfIn PDF document text
    • http://rmk4sale.xyz/lekibififasedusewulnv0pq.pdfIn PDF document text
    • http://soldonlittleton.com/fluffy_fall_fly_fast_to_dodge_the_dangeryng0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fdf48ea389cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_6022c57dcf06d.pdfIn PDF document text
    • http://bestcreditcheck.info/85594360380sq6wn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_6029ae8b056b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fee7d7f091a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_6005a64236475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5feb446f1eec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5ff1b7b44969c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_5fe5c6ac6e76c.pdfIn PDF document text
    • http://rubeatyshop.xyz/snc1d_chemistry_testi1pyg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fcf3979cad96.pdfIn PDF document text
    • http://topuniversityru.fun/757860013712itdz.pdfIn PDF document text
    • http://prodive.su/59017144804ykkmq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 5412 bytes
SHA-256: 45f9ca54fc9cbcd60d4cae40252da339c7882eb86fa715c101de206c4001f2f3
font_01_sfnt_off0000c895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 9868 bytes
SHA-256: 5c4ba61171255cfab8098870355078664eb4612b751c99be2f20fa09f9df5ee5
font_02_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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