Malicious PDF — malware analysis report

Static analysis result for SHA-256 8829cde577840abf…

MALICIOUS

PDF

83.6 KB Created: 2021-05-14 19:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ea796b7254ef6b538bf08b845d4535c SHA-1: 51efb36911913f80b4cd26d6eba414fed4f7c46a SHA-256: 8829cde577840abfe150e10a42f9b1e2b645455d6035a6c6a3d5eb0a157237e8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The presence of the 'PDF_SEO_LINK_FARM' heuristic and the high ML score indicate a strong likelihood of malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

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://nipisod.ru/strik?utm_term=contact+stiffness+ls+dyna
    • http://daimontimur.org/79021241554onhy3.pdf
    • http://baby-slings.ru/accuair_elevel_sensor_installp5bcc.pdf
    • http://ryursew.space/cryptarithmetic_multiplication_questions_and_answersqgmv2.pdf
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/dexuzozulagujo.pdf
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/077a55afad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_ee2e00ede06a443491137b49133ba195.pdf?index=true
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_14f4b59be7f241249ae462c2b9c25b62.pdf?index=true
    • https://s3.amazonaws.com/vapelurowar/business_letter_address_format_envelope.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_20bcce1e76924325bf5c5515004f9f8e.pdf?index=true
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_6941230efed44b6d860c49cf76f79295.pdf?index=true
    • https://s3.amazonaws.com/sugosubexez/46361223137.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/u_cant_see_me_video_song.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_6e0c1a5fb2944eca969e7f8d374eb459.pdf?index=true
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_ed7b86933cc24590bb9aaa78e2c1e356.pdf?index=true
    • https://s3.amazonaws.com/jasipefulaxiduj/jugepekevatufekum.pdf
    • https://s3.amazonaws.com/gofiguj/how_to_add_schematics_to_worldedit.pdf
    • https://s3.amazonaws.com/nitirew/the_scarlet_pimpernel_summary_shmoop.pdf
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_11d4f5a80ee143fb8b55554061752366.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_off000108ed.bin
888266015ade8fbef1100837beb8a624134559b8816220f5414a47c063309541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 4928 bytes
font_01_sfnt_off000119cb.bin
b30d1cbaa954b3fa2c2b7eb77b91f96179f2023a70e2ca72c787163f598b02bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 11612 bytes

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