Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b51370bd40dc38…

MALICIOUS

PDF

70.9 KB Created: 2021-02-09 21:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4dc7857f66461d41bf90d746d8e63cfc SHA-1: a39803a0b6d8d704d564f51cf795ffcb761f536f SHA-256: 93b51370bd40dc389b8914ea87bd8ba7ebcd4763e823505c2702a6e386a33980
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=cabrestante%20manual%20casero PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/mezifebu-denajus-ruzepogu.pdfIn PDF document text
    • http://idslim-italia.site/jomudubakibefesitudematd6q1.pdfIn PDF document text
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/jukit_mozevi.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/ji2gcif/top_100_hip_hop_music_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/chfW4ii/gem_hunters_mineplex.pdfIn PDF document text
    • http://cheapestshop.xyz/zojaluxinenatx9sh5.pdfIn PDF document text
    • http://freshmind.net/crossover_2006_movie_downloadchdvo.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/gusopewo.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/7e74564.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/fjchgWE/depikidu.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/4515087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujemivegelap.epizy.com/namixobuvizunupenoneno.pdfIn PDF document text
    • http://fopaguduvogo.rf.gd/37824787689.pdfIn PDF document text
    • http://merekum.rf.gd/77464158778.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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 4992 bytes
SHA-256: 6cc1cd88a94e6e1f2e02e1cc3f8c192849a2da5e161ad4f30270382dfae7053e
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 12432 bytes
SHA-256: f57c038ed77a42ab25cac3ab4a7cd89e8d2b55c4940b56f13ae92bf101c1b8bc

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