Malicious PDF — malware analysis report

Static analysis result for SHA-256 23585f2a63ded896…

MALICIOUS

PDF

76.3 KB Created: 2021-05-03 13:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d4d168fcf70cf1e1ae6659ad604a8cf SHA-1: fc21e4d3cadf1afaaa934b042b701ae18a21e41f SHA-256: 23585f2a63ded896df528164ae0237b43cc05bb55e2ce09bc1c7acc2a9970f5b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

Heuristics 6

  • 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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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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