Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d5a513c125422b…

MALICIOUS

PDF

71.1 KB Created: 2021-04-07 22:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2a645627cf132e1d0d35cb18a36b41ae SHA-1: 6a7379575b505aa15b4bfdd080be7c1212fb2922 SHA-256: 62d5a513c125422b3d04766bb3a34900cfe97a65770b6f25355ed8254f275482
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'M11 ultraclave cleaning instructions', aiming to trick users into visiting a malicious URL.

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://leonvi.ru/strik?utm_term=m11+ultraclave+cleaning+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488855/normal_600894f0324a4.pdfIn PDF document text
    • http://jafinipu.scienceontheweb.net/61747107551.pdfIn PDF document text
    • http://aycotoro5.xyz/life_is_strange_2vqglg.pdfIn PDF document text
    • http://detonic-italy.website/314764321640hm21.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/90044148355.pdfIn PDF document text
    • http://peteferix.mypressonline.com/kelixomuborowibosos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_603782cc0caed.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/86659178555.pdfIn PDF document text
    • http://bet-info.ru/69660580496ogyoo.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/b17f6622-6967-4994-a975-9e3cef08aa18/11820684421.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/37939472364.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/8239909355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5452f05-a9ac-4b97-b2c4-dc2955c4cbbf/cave_badger_5e.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/waxozukujupakowafuluwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086a782b-4184-4932-b76f-3334e1454fa7/how_many_questions_to_pass_the_permit_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/how_to_make_your_white_clothes_look_whiter.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/27980453816.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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 5084 bytes
SHA-256: 3135d2cd6182a5547389912448cd51140056792dc136e52aa515c6eafad50aa9
font_01_sfnt_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 10828 bytes
SHA-256: 6ce04c0a99c6121cde63443aaa417d0a96ac19a62cd279f1c164e661e0d25468

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