Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1300c76c1049f9…

MALICIOUS

PDF

92.6 KB Created: 2021-04-05 22:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f0409fef115b28c54fe7dba585bd4974 SHA-1: be8763caf05b73f83d8116bfd29de72eb8763173 SHA-256: 2d1300c76c1049f94d572bc847a72b6f162517ebcf04a5a11acf909203f3c652
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/award?keyword=platform+revolution+parker+pdf PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/CichjEn/gunman_taco_truck_by_dren.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/ilxcvic/dugaku.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/giKify1/92906408908.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/76bbf8342ec946b.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/3icidgh/70892235722.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/bixipajijawugozuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_600b8ef5a6934.pdfIn PDF document text
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/7899315.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/7925881.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/e9L1sha/nileren.pdfIn PDF document text
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/3931752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_6032ba00142a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_093ebb381891434da2724d0bb1c6366f.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_0210562380f7464494d6781dab24b66c.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_b943622b3a1a4cd7acb4e4ec75e44f36.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_38097122346d4fa9a0c49d20ac42da7f.pdf?index=trueIn 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_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 5132 bytes
SHA-256: c9b4617871c37ac8ead6577387980c6bf80dc5dfeba30c44e9e522590f202dae
font_01_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 11408 bytes
SHA-256: b4323c6a7933365ba5b129493baeca9eaba5353dd4d6172649baf557ed52b43c

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