Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0cd779d1795685…

MALICIOUS

PDF

72.5 KB Created: 2020-11-10 19:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8db6ad26aac5703c96282256d50683da SHA-1: 1bec6010ba0ffec94aca7822821be782707487a5 SHA-256: 9d0cd779d1795685987be421f904c9a6eab458497a11c667b4c8dab696d1085d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, indicating a potential link farm or phishing lure. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the PDF structure itself is used to host malicious links.

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://trafffe.ru/123?keyword=1mobile+market+app+for+kindle+apk
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8f28ba1cd51.pdf
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/8760526.pdf
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/belexinosowigi.pdf
    • https://kizutinapetesod.weebly.com/uploads/1/3/4/4/134490845/891115e.pdf
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f9ca67a12c11.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/d4597b.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/5632260.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/1d32287.pdf
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/zovosede.pdf
    • https://xowuwipasek.weebly.com/uploads/1/3/4/3/134310121/baweduzurutuno-mapotavozupi-vofati-sogov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5ea2d778-12e8-4f02-909e-478013964480/xikaz.pdf
    • https://s3.amazonaws.com/sezutuma/kudiwuz.pdf
    • https://uploads.strikinglycdn.com/files/79d82551-be7b-4e2d-afd3-f66be4ca9693/transitchek_order_form_2020.pdf
    • https://s3.amazonaws.com/luramamelolem/free_church_pews_in_texas.pdf
    • https://uploads.strikinglycdn.com/files/262a62be-71db-4bd9-a369-c9c1693327ec/covey_matrix_template.pdf
    • https://uploads.strikinglycdn.com/files/0228d705-2aa4-41e6-9a8e-6af441fb6c5d/91157584230.pdf
    • https://uploads.strikinglycdn.com/files/eb5b8918-7410-4b09-a7b2-cfb3b7132b8b/boo_radley_to_kill_a_mockingbird_physical_description.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_off0000d29e.bin
02d9e1f90a3d1daf0f38f80ca48a2744a27bb2895d5746bb29a0a8db601f37f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 4956 bytes
font_01_sfnt_off0000e353.bin
03af57eef1e7eb169ee79bbdfdd12305354624141b11a3720d92489d34681cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 10288 bytes
font_02_sfnt_off00010649.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 4324 bytes

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