Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bfdf8a7c17c731…

MALICIOUS

PDF

67.2 KB Created: 2021-03-16 10:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 31294ba44dfdfd8fca4e104ccffae7b2 SHA-1: bd605e10b4cb2c2eb99c25a9952f026c9b0aac15 SHA-256: b6bfdf8a7c17c73124d412e85f3e9c9d49592576dc6cdb20618f6c64ea1385cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains and Weebly hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to potentially harmful content or phishing 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://golowaki.ru/wix?keyword=cell+transport+problem+set+answers PDF link annotation
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/rudoma-difuzuxalovugew-kidepolunumijo-sukokufabugif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_602c680e63301.pdfIn PDF document text
    • https://putajomarope.weebly.com/uploads/1/3/1/4/131437676/8173037.pdfIn PDF document text
    • https://gagivoxiw.weebly.com/uploads/1/3/5/9/135991060/tobivos-wepixemikomomoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_600492a57d8af.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/lenagigid-livukixukov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_603f94812bad4.pdfIn PDF document text
    • http://afracheat3.xyz/7471500163322hsu.pdfIn PDF document text
    • http://goloszauniver.fun/terokigipuruvelemi34321.pdfIn PDF document text
    • https://janewabogub.weebly.com/uploads/1/3/4/4/134483822/wexowitububud.pdfIn PDF document text
    • https://nofojivebot.weebly.com/uploads/1/3/2/7/132740499/jivapami-pifejaxatexur-lurote.pdfIn PDF document text
    • http://stroy-level.ru/vavedexumuzozirorekubeze0ktyp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revudipepofaten.myartsonline.com/english_writing_skills_hsc.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/modelo_neoliberal_en_honduras.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 5100 bytes
SHA-256: 70aaad3a992ab3a86e85b9b8b806dc7b2b3556c4f312775a44395c1ea01e9917
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 10284 bytes
SHA-256: 67c49b7184ef758826dac6c6b917238b65baaae7a8bd7d97d846ff7e1e84705f

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