Malicious PDF — malware analysis report

Static analysis result for SHA-256 43950c0cd36f621b…

MALICIOUS

PDF

73.4 KB Created: 2020-11-24 07:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5d87e2521f93b8f040a7168d6dd34680 SHA-1: c21b79da1e6ce504e08e013223d0f5d0eb601f0e SHA-256: 43950c0cd36f621bef015cb7cc844204a2fb49a29c57c54eefec8979c2c1c64f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojan distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/strik?utm_term=transport+a+car+cross+country In PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/pafemaba_fexokafigarojad_luger.pdfIn PDF document text
    • https://vefarekosisag.weebly.com/uploads/1/3/4/7/134722728/mazebatitimuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f91e9c17391f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_5fbc651e23ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fadfecbadc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fb42856a2dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8b8f81dfd83.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/3464558.pdfIn PDF document text
    • https://gogiwujuduk.weebly.com/uploads/1/3/4/3/134352159/2779270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f9268c4c3ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f90a0c89181f.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/280ec4fb-e7f6-4e30-bba3-c6c62c3c63a5/4745287229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c62d5ef-89d2-4eb1-8097-00c6a57ff37e/danulusute.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 4948 bytes
SHA-256: 16672e6434fc977575a5080cc6bca5bdb031f7ed649dcff12fa134961de4701f
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 11724 bytes
SHA-256: 9ac935d5af88ee6797b65474e925707de343ac8a4912e53730bdbc3c6e08929b

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