Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9f890bfb206050…

MALICIOUS

PDF

66.9 KB Created: 2020-12-21 18:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e1bfa84bcb5fd921fac64602022596a9 SHA-1: 0ddf37abb1a575606524796663d702f20d3152ef SHA-256: cf9f890bfb20605062912d6b578030f604174519e4feefe2f1ec902d3cf476d7
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 a link farm, pointing to a URL that appears to be a lure for a t-shirt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous external links, including one identified as a potential PDF link farm, indicates an attempt to direct users to external resources, likely for malicious purposes such as phishing or malware distribution. ClamAV also detected this as Pdf.Phishing.Trojan.

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://traffking.ru/123?utm_term=star+of+ishtar+t+shirt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd1d607b1d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fca75e625f70.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/gimugip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f8c00cb8698d.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/0cbac8be-16f4-452a-b6ac-96552f7608ac/pivifisanamipegev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3905c0c-7cfa-4a1c-b007-52c78532546a/sig_sauer_p230_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/vobovalawadumitivum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f93d6d-70e8-414d-8179-cb12259ed86d/voditozotizedinebi.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/kulirusinolufezevinetago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b57117-47ee-4e4d-ac33-045b2b129cdf/retasufapako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18c3a6b-cc21-4c23-8152-c72526f4d4db/gawebibobon.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/goxenuxowifobu.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_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 4924 bytes
SHA-256: fe0648f508ceb337a04767f7420bf640d6de0f5abf36cf35dd15b811ef63acef
font_01_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 11788 bytes
SHA-256: 7acb152fdac4a298ad8e8b83f9b78cbf82d8a1d2eacd6cdb95a339b7e2fdc7b5

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