Malicious PDF — malware analysis report

Static analysis result for SHA-256 93de28b0d2121099…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 20:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b78fe4020284327e007d7d459780cb6 SHA-1: 474f668be0da449094965528b4368105612da92d SHA-256: 93de28b0d212109913ac086b63dc00f48e1ca2ca9225d433daf6cbe7e17b406e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

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://lozipotod.ru/123?utm_term=apex+predator+piano+sheet+music PDF link annotation
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/783388.pdfIn PDF document text
    • http://mufosozewolofar.iblogger.org/can_an_american_find_work_in_germany.pdfIn PDF document text
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/garijanugutez.pdfIn PDF document text
    • https://betisokoredig.weebly.com/uploads/1/3/4/5/134505727/pafurijido.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/ziloxile.pdfIn PDF document text
    • http://centerbluebadge.com/defuse_the_bomb_3d_downloadcuwck.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/golofusodamox.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/famazejax-zabawovajen-rijadili-lerur.pdfIn PDF document text
    • http://biomanix.best/pokemon_advanced_generation_rom_downloadqwt7h.pdfIn PDF document text
    • http://getfreecreditreport.info/zukepuzob33ibw.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/bioclimatic_architecture_principles.pdfIn PDF document text
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/vanureditoxadij-lepobaxaw-medas-dovakipub.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/99dd1de3e9c5c1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipabadidori.epizy.com/spelling_and_grammar_check_free.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/witorebujalumopemej.pdfIn PDF document text
    • http://fujesotes.epizy.com/68627041908.pdfIn PDF document text
    • http://joxelexudar.epizy.com/disclosure_report_form_n263.pdfIn PDF document text
    • http://duxidomotafuzag.rf.gd/22298317597.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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5336 bytes
SHA-256: 5490775ec6577bc9a7388d0ed79b10eca2c6f277363bf5a6be8f865a53f0d986
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10332 bytes
SHA-256: 3406183d9d83c75bb6a00e99e208ff948bd95130945f1478269cc64cd16c4ef7

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