Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e66a55ea7c098d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 00:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc09467ef5b5cc34ba5509f8c471e971 SHA-1: 2fe79f9966142b11d6a9ad1071e6c39419f71b2e SHA-256: c7e66a55ea7c098d8cb651614f125bf2f3f3785671007db79fd95576824ca849
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=happy+bhai+dooj+hd+images
    • https://cdn.sqhk.co/soredepel/gdNZnii/marooned_on_an_island_story.pdf
    • https://cdn.sqhk.co/demawanetufi/gy7LiF9/how_to_show_hidden_files_on_macbook.pdf
    • https://cdn.sqhk.co/vemetafije/gijdjfu/self-_adhesive_laminating_sheets_9_x_12.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_603f9ac9ad092.pdf
    • https://cdn.sqhk.co/duzimisese/fhaicGy/hornblower_dinner_cruise_san_diego_groupon.pdf
    • http://xutefizil.getenjoyment.net/dozevigowe.pdf
    • http://talemine.getenjoyment.net/96117422086.pdf
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fc7c1533e9fa.pdf
    • https://cdn.sqhk.co/lukavago/PZgdz6H/vakubotafipop.pdf
    • https://cdn-cms.f-static.net/uploads/4457861/normal_604129b7462fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazifozixawus/25957797432.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_1d9d9204ac5f46a5b8e8e492ad02a30f.pdf?index=true
    • https://7920a853-f458-4dfc-a893-f50c3ed6f780.filesusr.com/ugd/fe7850_224ff586d1ef447db404be196ad07cac.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_e31db5254356412384ac99005a78f551.pdf?index=true
    • https://s3.amazonaws.com/divelatoxa/babylon_berlin_ard.pdf
    • http://zipemoluligera.myartsonline.com/photodiode_array_detector_hplc.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_9332e4e2dfb34e4c9db3c2fb3cecc308.pdf?index=true
    • https://s3.amazonaws.com/faduxodiwo/39532801006.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin
f8775f1a6ce9d17ec4b80fcf971395d22bbbe31c0296f9f14b73c45f2329969b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 5524 bytes
font_01_sfnt_off0000f438.bin
a8ba320a0ac8a73a5a8cc2c47ba30bd151ec5f51af4d5ac0b9daf85eaa8f1301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 1936 bytes
font_02_sfnt_off0000fd7d.bin
9346a4fd9eff6e3bed4395f45c0c8bdfe59b4b5f8e3c380cccefe888ad8eb587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 11504 bytes

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