Malicious PDF — malware analysis report

Static analysis result for SHA-256 5022b7d03e91a977…

MALICIOUS

PDF

67.9 KB Created: 2020-12-04 09:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0306042234952249ce954ccad590705d SHA-1: df32d6c5f6fa36150b53f25c20008ba9ca0e1768 SHA-256: 5022b7d03e91a977ac09c694f8da375921a935f41beea701e7fb49b594accdbe
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • 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 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.
  • 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://traffking.ru/123?utm_term=michael+pollan+escape+from+the+western+diet In PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/ginanopozazuvoxi.pdfIn PDF document text
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/64a8ac011189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fb9f28fa5c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_5f902c35877eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f9474b71d453.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/juditibamepakoxivuze.pdfIn PDF document text
    • https://wiperuzikenod.weebly.com/uploads/1/3/4/6/134694852/1d3e231538d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f9418d30950e.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/d4683fd46654c7.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/ginutu/free_html5_responsive_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cdab3398ff75152d912c/t/5fc0f39d9b1ed03538fdbd4a/1606480797936/fiwosodibiporojedobe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13debbd14ff0dd29efe80/t/5fc3552a3f75b166433ed010/1606636843375/nia_pin_tufted_convertible_sofa_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac301f3-e7f1-4d94-bcc2-3889a7588788/1260591249.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_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 5492 bytes
SHA-256: 3629b51ef494cda1c4b9c36513a275d29079821658933dae0d2e922c8cbcd53a
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 10176 bytes
SHA-256: 94571f679dba45788423efdf7a4e1556456f5a16abed1a83604b16ec530ca9ba

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