Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6f6ca8c3757c1a…

MALICIOUS

PDF

69.7 KB Created: 2020-12-26 23:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37a4e05136e50d7d306039e19987a3a5 SHA-1: e234d2e6ada30974c61e50aaa325ca70ef400a4b SHA-256: 7b6f6ca8c3757c1a02d41aae5e3c32833458ca99c865541dd84bbf1c54d0f6d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent URL being https://traffset.ru/123. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffset.ru/123?utm_term=espectro+electromagnetico+colombia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc92aa83487c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fdabe8c6f0f4.pdfIn PDF document text
    • https://geduwitanezuter.weebly.com/uploads/1/3/0/7/130738684/217735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fc1b9f515657.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/44c8f1569251.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/db99b405-44c8-49e0-b7a9-9f41659670c7/tableau_if_statement_string_and_integer.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/template_design_magazine.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/latex_exam_class_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3df301-1d29-4b7a-b52a-eee9d4206e0a/5880775958.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/okcupid_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/fujomisupurugosalabu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/rizizuropurituboguriti.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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 5348 bytes
SHA-256: f4461115ae397e8319b7c0c752344256cf4f8db1bfcf2c71d1b78e4cc3d3cbe6
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 10884 bytes
SHA-256: 839e571a10efca1bce0902fd7684190be0c5a28b7e4017737bb09775b6a61d59

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