Malicious PDF — malware analysis report

Static analysis result for SHA-256 4446e11a44bb776e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-24 18:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07d144d33b6e8f40132e152cdbbd58b9 SHA-1: 28ba86d90e659cbd144f64d51eb7ce58b1294c36 SHA-256: 4446e11a44bb776e5749e14c63ed36ed038ddab103ef2d9c180515b425d0e80a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to driver downloads, which is consistent with phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=optiplex+755+lan+driver In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_60009489289af.pdfIn PDF document text
    • http://dkblogin-de.com/ripafnfbd2.pdfIn PDF document text
    • http://wiregabjuk.fun/motorcycle_repair_shop_brooklyn_nyymt5l.pdfIn PDF document text
    • http://ylyn.ru/harlem_renaissance_facts_sheetps7kl.pdfIn PDF document text
    • http://vezerfa.xyz/sedofokefomixivepjaiiq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6022f80fa132f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600a9a9d8885c.pdfIn PDF document text
    • http://bigpleasure.ru/rusojixutirobagefitopij1wjg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6015f1fa0f56b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5fca6af7ca3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_5fd74302cd3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465543/normal_5febfe85c8f47.pdfIn PDF document text
    • https://bejizasidofivi.weebly.com/uploads/1/3/4/2/134234705/monugano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_602b06d09000d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60223c524639b.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/475642.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/1586553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesotat/401k_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/jekef.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/fakozinadowik.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

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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5132 bytes
SHA-256: 727a2a347423ae1fe4f2ec553394ddd4aa3da9c7bfc46a5a1261cd9d41dad9fc
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10720 bytes
SHA-256: a6a5c33775cdbf28a357ac083a2307bbea22695fdb7149cf86eacc9fd3a328bd

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