Malicious PDF — malware analysis report

Static analysis result for SHA-256 9108542fd84e5f02…

MALICIOUS

PDF

66.9 KB Created: 2020-11-11 09:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 67357d7eb6542c5e10f593fde3d611dd SHA-1: 86a45d70cccdb4dd46cbef8e36d6cadbf2e47951 SHA-256: 9108542fd84e5f022e99a79790f4db500b357726552f15b4b8d03a14f4148a0d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content or facilitate further compromise.

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
  • 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://traffine.ru/123?keyword=vampire+modpacks+for+minecraft In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f9f7d97a4477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f8b10bf5ed49.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/2710640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f9c1a64e7918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f9313d819ff2.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/zomamima-semamopitobelaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_5f98f8ed78c80.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/xanebavifamopez/15486035404.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/84000056795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d5ee49-25b2-40d3-abca-2b3f5efe3f3b/sufigerexetib.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/68818391297.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/sunawerotazu.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/defensive_pact_stellaris.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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 5296 bytes
SHA-256: 78c91f2200d63dbb692f60109c99acae455f14f1df4dc500c836ac2e69cb475c
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10616 bytes
SHA-256: 5846db1397cd3c91edbbe3d38446f2c44ebd01c9a8d06b96f03e7f9dbef12ff0

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