Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5444a49fa4a272…

MALICIOUS

PDF

83.4 KB Created: 2021-02-22 21:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3753218389f2b0c1f96eeddf6152f897 SHA-1: a35539137d13f40e986d2662e84c673199c16bb5 SHA-256: 0a5444a49fa4a2729ade800749f8b29c981a6e4c083053cf6cdcabb852147f83
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/123?utm_term=how+to+get+psa+marriage+contract PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499651/normal_6003fb1cb64ab.pdfIn PDF document text
    • http://ru-payment.casa/dovapimifezoi53d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_601f71a72b61c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5ff509fe6dad6.pdfIn PDF document text
    • http://tehnopolis.org/698907547510fr9r.pdfIn PDF document text
    • http://unonatur.space/pin_code_for_king_circleie7ho.pdfIn PDF document text
    • http://winoraama.fun/trader_joes_frozen_turkey_burgers_cooking_instructions82rxx.pdfIn PDF document text
    • http://tk-pobeda.site/miwazokeburabaselukuzdgbge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd82a346911b.pdfIn PDF document text
    • http://covidcapsule.world/55354468882cvuew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_6020534182ddd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_5ffcb858ce306.pdfIn PDF document text
    • http://reduslim-officialsite.site/colon_cancer65g1s.pdfIn PDF document text
    • http://timecodes.net/the_silver_spoon_cookbookv0d6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_6022cfa90e63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_601dd1d7b1bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5fd3a78780b67.pdfIn PDF document text
    • http://tomogorman.com/ocean_personality_test_truityc165f.pdfIn PDF document text
    • http://amst-watch-v2.club/what_are_some_major_landforms_in_australiaeq017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 5276 bytes
SHA-256: 3993837737640adedaab237ab97d1d609d7b8e792d25e2df6f66b01d25d69d6a
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 11140 bytes
SHA-256: a692d602978fcf413eef93cf5a55d0f0c94418cf3af7a4cf3b5bda1c137d4d25

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