Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd3d5add3a12a04…

MALICIOUS

PDF

87.5 KB Created: 2021-01-19 23:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 11d46a76542860d38c9a549037d33276 SHA-1: e356ebd927cb42591c45507162e0a1b2bf5cb376 SHA-256: 6bd3d5add3a12a048291b39c149eca21496c2a5de84003f66d18592834efd8aa
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector and a link farm on disposable hosting. The embedded URLs, particularly 'https://traffmen.ru/123?utm_term=1.5+inch+pipe+in+cm', indicate a clear intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest an attack pattern involving malicious links designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=1.5+inch+pipe+in+cm In PDF document text
    • https://cdn.sqhk.co/biloriput/iib0r7n/42130328708.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/88863c29a4127b.pdfIn PDF document text
    • https://cdn.sqhk.co/mafokesaxuvi/Licsm3Z/51406042446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5fa547bd82830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_5fc04b704b9c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475563/normal_5fee6b62a2106.pdfIn PDF document text
    • https://nobozemesatib.weebly.com/uploads/1/3/0/8/130874372/9448061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f94d85a910ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fec9fdeb6ded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5fce4581403cf.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/myhjgc6/gapinarevarexugosowiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://malinaliwul.epizy.com/70731614289.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/steering_committee_meeting_template_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/calidad_total_y_logistica_jose_presencia.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/about_yourself_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/9298607032.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 4772 bytes
SHA-256: 164323ef32a5e3ff3688e66656446b7e95900e7f336ac5a15f3a32b139fe97ed
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10112 bytes
SHA-256: d5810c8f3f3eef321c3c89058873c0f9bc701505f582d8ba2e2865ac59594630
font_03_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 12196 bytes
SHA-256: 9eca0efad967465bae0fbb6db8917ec1802a0ad61798328106735183bce8b675

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