Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e3c958a03acbb4…

MALICIOUS

PDF

79.4 KB Created: 2021-05-03 13:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28684f6427a0cef706d7f60b351d7e29 SHA-1: cedbbc348c4c523c4c438cb92fc72902e4a55825 SHA-256: 61e3c958a03acbb4f4ec4b6658f8e8c954e267eceb8a2413b057502ef8412603
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to Weebly and other file-hosting services, suggesting it is part of an SEO spam or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating the document's primary purpose is to drive traffic to these external sites. While no scripts were explicitly extracted, the presence of numerous URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=what+is+the+benefits+of+wind+energy
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/1d29b29d334.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/6097314.pdf
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/kukamenitasezamez.pdf
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/fatexutapale-logepuz.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/jujekegow.pdf
    • http://trixy-matrix.space/holmes_oil_heater_recall0k1ci.pdf
    • https://natevotid.weebly.com/uploads/1/3/4/7/134773148/339457.pdf
    • http://swiss-gear.store/castle_clout_2_return_of_the_kingoywo9.pdf
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/9768533.pdf
    • https://pebolaxakaz.weebly.com/uploads/1/3/4/3/134349421/0e45225488baca1.pdf
    • http://anarchymedya.com/66448984904vf4ct.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_2e90b05665c6403585f7c3083cbf2925.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_852c5dbc9055418eaf22912631e19e55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b911bdf-0292-4fa8-9019-65fe2c296b51/97290904022.pdf
    • https://uploads.strikinglycdn.com/files/05b318e8-04b4-4a03-a4bb-2c0eea152da4/wesedirixubelex.pdf
    • http://joxelugokolutu.rf.gd/xotuzute.pdf
    • http://bekujefil.epizy.com/bangladesh_passport_application_documents_required.pdf
    • http://govatojajij.epizy.com/33188172614.pdf
    • http://tofixadik.rf.gd/nudogovebejavewo.pdf
    • https://uploads.strikinglycdn.com/files/5c926cfc-25c8-4f65-91ce-0066167d38cf/new_criticism_literary_lens.pdf
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_202e4cdc15714842a80b0cc7180bbf96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/435e2af8-5aad-493f-8849-efde9f6aeb3c/master_of_the_universe_edward_and_bella_fanfiction.pdf
    • http://zagaturatok.epizy.com/rimisukitegakuti.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_off0000f71b.bin
7f4ebf86e0a25a2fb89b41f0a963e14b89d4a888f44d685a1559ccd0c59d62bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 5484 bytes
font_01_sfnt_off000109d7.bin
17a59b48334e445a1c6c8b4139d1fafc13c6847e4f8c3444d5afc463d39b6bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 11372 bytes

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