Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be3c71dd27a100f…

MALICIOUS

PDF

79.3 KB Created: 2021-05-10 06:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333ec70d061cac6feb549cc064d1bad1 SHA-1: 24d8ea9e1df29aa4c29aef51c3daf061c0ed70e8 SHA-256: 1be3c71dd27a100f0c636c265c0d1b714cca83d8da8bc185ddfc2402c6928dc4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to benign-looking PDF files, but one prominent URL leads to a suspicious domain. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://midufefew.ru/strik?utm_term=replacing+control+board+on+kenmore+front+load+washer
    • https://cdn-cms.f-static.net/uploads/4389824/normal_60639ec0168a8.pdf
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcbdd099117b.pdf
    • https://fipupoluvov.weebly.com/uploads/1/3/0/7/130775710/854c5d9.pdf
    • https://cdn-cms.f-static.net/uploads/4379602/normal_601949bfa372e.pdf
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/816fdeff.pdf
    • https://cdn-cms.f-static.net/uploads/4415782/normal_6026f6f4bef09.pdf
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fca7f8c25f03.pdf
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/mofufat.pdf
    • https://gotedajasokidu.weebly.com/uploads/1/3/1/4/131407980/labikumikajukevoju.pdf
    • https://cdn-cms.f-static.net/uploads/4530171/normal_606312f31cdcc.pdf
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fdc7b89bb56d.pdf
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/0f8ee32431.pdf
    • https://wanujonoguj.weebly.com/uploads/1/3/1/6/131607110/nugalef.pdf
    • https://cdn-cms.f-static.net/uploads/4464715/normal_606ab3018febe.pdf
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/dc0291833b16f8.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5fd2c4f0a7474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rimejiguvif/bootstrap_3_center_form_horizontally.pdf
    • https://s3.amazonaws.com/dobikasukavu/acer_predator_orion_5000_manual.pdf
    • https://s3.amazonaws.com/sojaxub/49924355995.pdf
    • https://s3.amazonaws.com/belopudevuzuza/bubapikiburilawodun.pdf
    • https://s3.amazonaws.com/kokesatodixon/how_much_is_a_wii_in_2020.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_off0000f758.bin
f49089247f5ed5c21b8789420ca1b0e52446c829a008ba44881b60e19f524e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 5872 bytes
font_01_sfnt_off00010b45.bin
8547867af60e955c41c65201bb97af3c29cab42c8aea9704a940b8ef4f8f6af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10512 bytes

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