Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c1c2bbe31f6cbc…

MALICIOUS

PDF

72.9 KB Created: 2020-11-22 11:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e845972d3f49861c9d234bb07f1a8e35 SHA-1: ad9e8f477772c430f3ac65de17aa830b56e0c71d SHA-256: 89c1c2bbe31f6cbc3c1c40a85cf8fee44ab87c8e707f5ee692cc22b6237baf10
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://trafficel.ru/123?utm_term=conan+exiles+armor+stats+table', is particularly suspicious. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its direct user-facing purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=conan+exiles+armor+stats+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f90bb23c3ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_5fa9b0c130210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fb529718f420.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/kedodonetidor.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/dd7954f9f825dd3.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/819368.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/1e853a82f77fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fb6217e8ec0d.pdfIn PDF document text
    • https://vikesuluwok.weebly.com/uploads/1/3/4/7/134763763/c9a5af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/doronolaxufor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7d1028-e357-452f-8b71-f9375bda4575/gorabuferuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09297658-f19e-4e36-9b38-5b51b9ffbf3a/wurugugoneraxizagokowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6e0881-baba-4cbc-a9b2-8fdda36eecfb/55024203597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cb21f7-16a6-44c3-962c-5b1dcc5b54d3/car_visor_organizer_for_sale.pdfIn 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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 4944 bytes
SHA-256: 343d1d2638cbb259b6371681b3a82638fe3f3a0c2f722f932f9d8cec682aff73
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10236 bytes
SHA-256: ca0ed77306fbf81bfc8ecb75c50b85d9801909dc613d7f5e6613e847aac82fd6

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