Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e36ed27bd2d8641…

MALICIOUS

PDF

88.0 KB Created: 2021-06-04 02:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4dd37f1fa475f6318303056785f761 SHA-1: 3485e8435c1cfdc015190a468a3a03cf93580de2 SHA-256: 1e36ed27bd2d8641e6bd32747d58f57cf5f2107ad4497eb8d880c24d8aa83d3e
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery, aligning with phishing or content-luring attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/vuturexedosewam_xodowopojumage.pdf
    • https://cdn-cms.f-static.net/uploads/4488102/normal_6025fc4999799.pdf
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5fef466ce8b6c.pdf
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5fd1ad543190e.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5fca18295648a.pdf
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ffc1cf6e491a.pdf
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff3d8c5e0b34.pdf
    • https://cdn-cms.f-static.net/uploads/4374685/normal_60145c90426fa.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_6036e1524cc76.pdf
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/6580250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=what%20does%20it%20mean%20to%20be%20a%20quick%20study
    • https://uploads.strikinglycdn.com/files/ce2c5cdd-c49b-4502-9eb6-29b8d6548414/kewubumugubar.pdf
    • https://uploads.strikinglycdn.com/files/c4a4fd35-6022-4eff-b0eb-b734de5bef96/maze_runner_2_full_movie_download_in_hindi_480p.pdf
    • https://uploads.strikinglycdn.com/files/68c7bd36-7d90-4f71-99b2-3220dca84a19/xezovakefuzu.pdf
    • http://xetibubib.pbworks.com/w/file/fetch/144425187/sebinokibulodajele.pdf
    • https://uploads.strikinglycdn.com/files/e54d47d6-f476-43f9-b83d-039529aef4b0/powermore_snowblower_engine_review.pdf
    • https://uploads.strikinglycdn.com/files/ff856ca0-e6a2-40c5-96d1-15bab35ed25b/used_dillon_650_for_sale_canada.pdf
    • https://uploads.strikinglycdn.com/files/10e13664-8fe7-446c-9915-906fc73ec664/watch_tales_from_the_loop_episode_3.pdf
    • https://uploads.strikinglycdn.com/files/b2469d3a-8415-4bbb-ae36-8f58b8149a72/lamawenamurariroga.pdf
    • http://kakewizajupe.pbworks.com/w/file/fetch/144579075/visuk.pdf
    • https://uploads.strikinglycdn.com/files/8708f7e4-7860-4686-8241-11f6217fe375/how_to_cheat_on_word_chums.pdf
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144577902/gerenifufaxifofegiliv.pdf
    • http://kufogokoges.pbworks.com/f/rotations_about_the_origin_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a92.bin
26726c457f0dded5811b0304a57af0b79416006fb019c0b655598269ec95de30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 5496 bytes
font_01_sfnt_off00012d31.bin
d964a78427666a1cd540bdf9d5612e1f6cb54529c95d38b82170d06c0a752bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 10948 bytes

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