Malicious PDF — malware analysis report

Static analysis result for SHA-256 548b769174add1c3…

MALICIOUS

PDF

79.2 KB Created: 2021-03-31 08:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af89dd6844702aebab26cf52a5e0e562 SHA-1: 9b2eb870c72b1e90ba472f3a63f3a1d488248a07 SHA-256: 548b769174add1c3049c056ce8a98aa844986dc9c0aa3360c4c7bcaca8595db3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is used to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/wix?keyword=icml+2020+venue
    • https://cdn-cms.f-static.net/uploads/4495536/normal_602a3d58bdc3d.pdf
    • https://cdn-cms.f-static.net/uploads/4455914/normal_602b0622ae1da.pdf
    • https://static.s123-cdn-static.com/uploads/4471514/normal_6005290ad53ce.pdf
    • http://gakawisogafuga.mygamesonline.org/gatotiv.pdf
    • https://cdn-cms.f-static.net/uploads/4471106/normal_5fe6ad73baafa.pdf
    • http://fobexugelego.getenjoyment.net/3m_tape.pdf
    • http://potuxoposutu.medianewsonline.com/27819016788.pdf
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fd03bed645d6.pdf
    • http://manovina.mypressonline.com/the_maze_runner_full_movie_in_hindi_download_480p_filmyzilla.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_60314eb4a7928.pdf
    • https://cdn-cms.f-static.net/uploads/4388038/normal_603bebc4bea2c.pdf
    • https://cdn-cms.f-static.net/uploads/4379626/normal_60513f9e815c7.pdf
    • https://cdn-cms.f-static.net/uploads/4414847/normal_603e16e56a6a7.pdf
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdf
    • http://gosugas.getenjoyment.net/kuxedifikub.pdf
    • http://zekaxezixil.medianewsonline.com/84697256458.pdf
    • https://cdn-cms.f-static.net/uploads/4452372/normal_601f710a22d31.pdf
    • http://nopotaz.medianewsonline.com/fivobe.pdf
    • http://fibutogu.mywebcommunity.org/15808456853.pdf
    • https://cdn.sqhk.co/nixagigad/ibhhGjc/jojijinow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bidejepeko.onlinewebshop.net/digital_marketing_interview_questions.pdf
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_774e6aa7589c4b8d8c036511155fb52d.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_946cf74d5ed74da4a585eaceb8d9c296.pdf?index=true
    • 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_off0000ee7b.bin
70cce6a9a85841f4c9f4af2a18a4c11f98f06892e6a5db1a69321bc3420fd3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 4376 bytes
font_01_sfnt_off0000fd3b.bin
7a8ae2a06123152614574a37d1ff83518f5330a5e84b4a2c92548285f7a2de38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10680 bytes
font_02_sfnt_off0001215f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 4324 bytes

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