Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfa9d399323a82d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-27 23:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d688cb224ac76113a883bac4b0c63d44 SHA-1: 805877e27d71efbf06217786bc55b779c5a7b977 SHA-256: 5cfa9d399323a82de5f205079088bb6cb9013195e89783abfe5cd1a20fa8fc41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to cleaning a saxophone mouthpiece, which redirects to a suspicious URL. Heuristics indicate it's a link farm on disposable hosting and ML classifiers strongly flag it as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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
  • 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://druttle.ru/strik?utm_term=how+to+clean+a+saxophone+mouthpiece PDF link annotation
    • https://jibarekoruw.weebly.com/uploads/1/3/4/4/134445620/febobaxazu_zobokogiwatenuk.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/6189450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_6043460cc8384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_5fdb1218243ad.pdfIn PDF document text
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/c1431d7.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/jgzPAgj/wejamadafitore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd258a61b5bc.pdfIn PDF document text
    • https://gedowejokose.weebly.com/uploads/1/3/4/0/134040639/908daeebe90373.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/dSffhiF/ant_colony_killing_grass.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5ff51db47a190.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/zulaguv.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/6037278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a5b05-e4ed-416d-8d96-ebd9a3102d47/physics_1_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/26881730789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169b5a07-65f5-4ca4-80e3-d63aa44c9b43/xivobibexekora.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/nizutizomusefojugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a33395-c46b-47aa-80a9-afe47a45bed5/xefisezakezipivij.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/fubowutirarepa.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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 5196 bytes
SHA-256: d0c6a682d67034c1e14b9a56c47c6eca0860a0226e6d6c40f98d7c3a5760b930
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10808 bytes
SHA-256: ad4551d4c804411e02bc5638119a2b52926d454b119304a4556360d189422e89

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