Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0d99370645cbf3…

MALICIOUS

PDF

65.6 KB Created: 2020-12-15 16:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d9ffa35bce08833b211765b4867c4813 SHA-1: 6a58063daf4a81c7a93870f69f2ebc10580f172e SHA-256: 7b0d99370645cbf316f3e129d137a80212dc9ee4ba35bea48ee498fa57d6f1e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://trafficel.ru/123?utm_term=check+if+key+value+exists+in+dictionary+python, is directly embedded. ClamAV also detected this file as Pdf.Phishing.Trojan, suggesting a phishing or malicious content delivery intent. No scripts were extracted, but the structure and heuristics point towards a malicious document.

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
  • 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://trafficel.ru/123?utm_term=check+if+key+value+exists+in+dictionary+python PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fa20e8ad1c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_5f93509db6925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fd1e82f3875b.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/dd8e0078bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d749aca54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fcf5bfe2a7cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5fa18d68817fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fad93236534e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5fcc25233bb7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f998f473d45d.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/5fc1cfa22cf09257bd7273ee/t/5fc4aa76145a8629dc448bfb/1606724215542/15746683933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b65dfa-e920-4b5a-b53a-033ee2a8c89d/what_patients_say_what_doctors_hear.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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 5444 bytes
SHA-256: 9049a4fcf3a751ea1c9f91127dc4731e296029b3f810fac2d26edfae1e932768
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10536 bytes
SHA-256: e6dea2d869829adc0c44f4f19c1fe717ceaaa99af861d7480ae7016b4d8a5a82

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