Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df5d32aa630d849…

MALICIOUS

PDF

92.0 KB Created: 2021-04-05 03:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae86f29e5ce05fb2d31dd00b887b0ded SHA-1: e9739166425c7ce2a5a05dd5f99c30c2aa31bd51 SHA-256: 6df5d32aa630d8490913423b5d791201790ec91598e8d6b8003dd7ea7380af03
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be related to search engine optimization and links, reinforcing the lure to external resources.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=websphere+application+server+architecture+pdf
    • https://static.s123-cdn-static.com/uploads/4496360/normal_60068d6f55db1.pdf
    • http://awpmode.com/88982595110sxqga.pdf
    • http://kalowodopole.mygamesonline.org/22956909226.pdf
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/607b31224.pdf
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/wavuzam.pdf
    • http://beach-fruit.fun/running_rich_vs_lean_2_strokee8kg2.pdf
    • http://bigmagazin.xyz/65761431747l91ls.pdf
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/kumakujebu.pdf
    • http://kovatafob.mypressonline.com/java_interview_questions_and_answers_download.pdf
    • https://cdn-cms.f-static.net/uploads/4413845/normal_60165f015414a.pdf
    • https://cdn-cms.f-static.net/uploads/4503214/normal_6049afe6e83c5.pdf
    • https://cdn-cms.f-static.net/uploads/4462066/normal_6042ed4d0e593.pdf
    • https://cdn-cms.f-static.net/uploads/4452608/normal_602586e24ea6f.pdf
    • https://cdn-cms.f-static.net/uploads/4470218/normal_60152a77ea305.pdf
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/lodomobaxobu-vobisotelubu-jumewaned.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_3d6c0d5803dd4bbebf6390867b0e0832.pdf?index=true
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_1e1255501fca42358f41a2cb93aae41e.pdf?index=true
    • http://wifofevowogak.onlinewebshop.net/53210306985.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_1bcc0e5f2a7343a1bac32af5ddd07c03.pdf?index=true
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d0f8653e905a4318ae825ebc2bccf3d3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292f.bin
bb1bb6199b7be5a34e30a3c00f9bec97d83e55f3e76defd753be4e660da46a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292F 5456 bytes
font_01_sfnt_off00013bc4.bin
6138fbad9cea8cec0718f59153a64f5169e8db096018e88050c7ad4912124a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 11348 bytes

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