Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c0460e6453cd8a…

MALICIOUS

PDF

66.9 KB Created: 2021-05-25 04:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6206efd3384974feff63c2839da3321e SHA-1: 8dafca2e4970550d90651cc14b46736020109eee SHA-256: 23c0460e6453cd8a45cd1fcfcede72c5c4a21df33f11d8125b3d38d026512239
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8274

Heuristics 5

  • 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 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
  • 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://druttle.ru/strik?utm_term=flax+meal+nutritional+value PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374537/normal_6001041750907.pdfIn PDF document text
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/fovusunawajogosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_602dd369547e1.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/578070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_601c96005f527.pdfIn PDF document text
    • https://zavenikalob.weebly.com/uploads/1/3/4/2/134234813/vekozateg.pdfIn PDF document text
    • https://janazasifopuno.weebly.com/uploads/1/3/4/4/134437996/7896448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fd182bc90c83.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/juserozowaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fc96b28015b2.pdfIn PDF document text
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/918135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_604109437336a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_600bd8a764619.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/9665fdef9d77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04df83b6-22f1-4b0c-b7ae-687583b13ec6/logudakulimi.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/37846676428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9a66cb-4334-459c-ac28-eb7fc05d3b9c/frederick_municipal_forest_fire_pond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ea4424-0c81-4cdc-887e-d5aeec04448f/23377809962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1214faa8-7cee-4492-b992-6a451a974a1c/whats_yes_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/favaxonitezepoful.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/71687255269.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 4736 bytes
SHA-256: d2d43fddbade18f3c76f190eab28df85c368fc4fa1ea0f59fc3f0e62d30be6a8

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