Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd7f326812a7b1…

MALICIOUS

PDF

74.5 KB Created: 2021-04-04 06:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c8fb13b4de46d21a2b8f3766031c3d9c SHA-1: 20c4bf0d703f57df0bc77bd1dfc6690a36bc7e16 SHA-256: 18dd7f326812a7b17e97cdaa88e6d4216d5efcc01b262421fea72a9adfda0d34
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://vilenefex.ru/strik?utm_term=python+finite+element+method+analysis+using+abaqus, is embedded within the document's content, indicating a potential phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://vilenefex.ru/strik?utm_term=python+finite+element+method+analysis+using+abaqus PDF link annotation
    • http://xulazawelinuze.scienceontheweb.net/adversus_nationes.pdfIn PDF document text
    • http://cosmicgig.com/t_i_zombie_catchers_hack_iosrccwm.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/fixed_asset_management_in_ethiopia.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/72208795555.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/46507582293.pdfIn PDF document text
    • http://alkim.xyz/taus_machine_translation_post-_editing_guidelinesqtwqr.pdfIn PDF document text
    • http://xejelofewi.mygamesonline.org/dazufonezetevifidawawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ea17505122f04791b6eacfefd81842ef.pdf?index=trueIn PDF document text
    • http://xujided.onlinewebshop.net/29460223602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9e504d-ad6f-4228-b7d1-d03b8e960e66/80052438769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d535129-a1ba-4eb6-9408-70ea2abcec8b/zasodowirefunafunevuf.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_1e35731a716046cd95c78d47fb9354df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e71f59-e677-4b2b-9243-dee218cec155/vegaz.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_bdb7cb16fa8c40efab53fead94f12532.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_badc2753f2a548f98a7277cd1a40b0f0.pdf?index=trueIn PDF document text
    • https://ecb9c71c-2d85-4c63-b07e-987367968d49.filesusr.com/ugd/a86d68_aede619a662b4825b10b760fe2e61a8d.pdf?index=trueIn PDF document text
    • http://wilaroxu.atwebpages.com/70492589597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2661a11e-7085-4f79-b61f-af49084c8ff7/kuwinupinotikumokojem.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_7d9be652f0c64d96a6cd6efb93026b4d.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_87663cde69a94482bbfc58783271d1df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d484a2f0-3035-4d3c-b7b5-15a9371d0ed1/92297613333.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_36385cb9560748aea2c9474ab8baa6b6.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_5cee472c04554e7abe8447de8bea7b0e.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 5592 bytes
SHA-256: 4c77af83b0bb50160e32f4b68b51669b460e578231196330a97775c6e43daf63
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10552 bytes
SHA-256: 26ab510b27c102fe095ce9002c5ff06b82ddd2f0de46e532759c053b18211525

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