Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f636281867945a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-25 09:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ab38fb2335a23256b70aae57a28da5eb SHA-1: 3f6d5f369dc82292919a662371999a70d3b1c976 SHA-256: f4f636281867945a1dc65c8fc1b35f3db6757ff846c92fe449bb382e0677ed0b
126 Risk Score

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 embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'free sheet music'. No scripts were extracted, but the presence of multiple external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://xajibur.ru/123?utm_term=free+sheet+music+blessed+assurance PDF link annotation
    • http://pristav.pro/58362892036on95m.pdfIn PDF document text
    • http://kamini33.ru/notopisubuxiwonug5tq9t.pdfIn PDF document text
    • http://slimerecipe.org/jujarubupederuwelegomilun43i3.pdfIn PDF document text
    • http://vizionsmc.net/saeco_odea_giro_plus_descalingkcahw.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/hiwmnVm/lidesanadalixekor.pdfIn PDF document text
    • http://rezltml.xyz/physics_textbook_answers_class_10_icserz1h9.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/egbMJVa/73569904034.pdfIn PDF document text
    • http://changepass.online/69371691543dgbch.pdfIn PDF document text
    • http://firstreadersclub.com/ielts_listening_with_transcript_and_answers86gyt.pdfIn PDF document text
    • https://cdn.sqhk.co/nonofukunumu/7ichbig/37689160438.pdfIn PDF document text
    • http://rentline.pro/osu_campbell_hall45zv0.pdfIn PDF document text
    • http://losinglotterynumbers.com/kesumowaragufwbcgu.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/gehjr0u/15926509509.pdfIn PDF document text
    • http://outputqwvk.space/8687391838xgch5.pdfIn PDF document text
    • http://skywonder.space/wepasirusobufuwemimawotjw7sl.pdfIn PDF document text
    • http://mainsale.info/wasting_my_young_years_piano_sheet_freeaglri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_c67a3909ddb4425aac517906dc508bb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f6f3bd-7f5c-4183-8c4b-842d3dca3981/vosinanezukepinuletivejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417b193f-faeb-4106-9251-3fd31331faa5/tojeranilunarojejapef.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_96a2962f2d724ca29198c8f664dcd05b.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_9a9a8cb135d54d26b17d62e4314e1903.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70517d8-ff9f-4ceb-85da-2a978745d85c/kamolujagupurogopej.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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5272 bytes
SHA-256: c12308090a3303f8792db95c74c8274c7669cd088aac2ee008d950df0cfa3052
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 11004 bytes
SHA-256: cc8622129f79269cd1ee16ab6b8d1c648a1c2f69eaa2bb18bcbd356190036fb2

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