Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0e13efe5135ddb…

MALICIOUS

PDF

70.3 KB Created: 2020-12-10 02:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9a182cdb2f539c4c9af876404d5bc66a SHA-1: 9281542166ecc1215202db7011f69e73faf717fb SHA-256: 9a0e13efe5135ddb1da3c06b0beefeb48227aad702f2aedaca0480ef2a0ecc9b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/123?utm_term=gene+expression+transcription+worksheet+answers In PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/23591a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5fb2912d97526.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/3616183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_5fc20d5539cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fa06fe1819fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f93d70bf0175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fc73108c13df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fbf2e1432b21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fcbe1ef79763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5f9d776d9d374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5fa7007ad2ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fc267341212f.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/d391a366-826d-4377-bd2b-1135683bb722/sememotezizuvepevolopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0441c4dd-7f51-4b41-af34-e2ca5a54ba85/4l80e_transmission_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a0eec0-bd50-4083-bb39-076a0e82a15c/black_and_decker_mini_fridge_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5a2e84-0b2b-44de-8bfb-c765765e0c4d/85021633081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753700b8-2678-43bf-8f9b-ad4862e966bf/kajekeribozatizekevug.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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 5244 bytes
SHA-256: 11c98a9350cf020c203e8cc00a2b8dbea73e2cbd400112751b7e27a71d3229b8
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10296 bytes
SHA-256: 6dd42c23ed91e129968ec967a105a6ce3b1fe46488adde80ec59982b1709c37a

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