Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12ff9a0f3413955…

MALICIOUS

PDF

71.7 KB Created: 2020-12-16 18:16:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 70bca7cb12a37cfa7b9dd7c63914dedf SHA-1: 3fcd9362a872021425c205f73070564660a3e46d SHA-256: b12ff9a0f3413955a835b253515fd84702a7386e6c53e508b72b4705e7967523
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM', suggesting it's part of a link farm or SEO manipulation scheme. The primary malicious URL identified is trafftec.ru. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://trafftec.ru/strik?utm_term=science+magazine+press+release PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fc76524cbc22.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/30d7310de.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/rodeloxagiwiki_zumef_mivatile_kiropifere.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/debogowosawijik_timikuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcd1f8b26543.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/dawinitozogejodeted.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/f1c1c1383b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc552dee5c7695ca9b8dc4b/t/5fc6f48bb2fa4660c8c6dbda/1606874252593/santorini_greece_vacation_rentals.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed012e537a05ef0936a0/t/5fc1005608845d0924add55c/1606484054102/penn_state_world_campus_microsoft_office.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f06b104edf1d7780fa74/t/5fc136449b1ed0353807dfc4/1606497861177/43812189554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09c604a-c2cd-436f-a427-3e74fee2a21e/2706332352.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b5ea81fec0096843efbb/t/5fc8c5308bd77935675922aa/1606993201151/sorize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b46235f-f513-47d4-b905-b18a71032f2a/borderlands_3_xp_farm.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 5404 bytes
SHA-256: 709176367e0589e42f7702b166dcfb10f3fbc2ea6e232257f5e406ced5904fe1
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 12616 bytes
SHA-256: 1ce26fb940c07634fefe8a343e291835ae3677aa8590bb88362c33da5928fd3a

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