Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9d3161acef20da…

MALICIOUS

PDF

56.9 KB Created: 2020-11-16 23:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 13651df6eb9da677fd8c309e16fd40aa SHA-1: dfc7cf4983498827d559dcc7d9c45e132900f0f7 SHA-256: af9d3161acef20da9440ebfb38512c00375439ba8f8ef8d70a0fa690c75b8b49
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=carrier+thermostat+owner%2527s+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457320/normal_5fb294a99b0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_5fa833604c5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fa698ce00ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f971f38c5b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f878a09a03c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_5fa4be1bd4400.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/3505730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8fd3621baf9.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/5be37e909154f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486971/normal_5fada188246db.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/wedosonevaparoduwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_5fa611048de0c.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/bivanud/suwumavonovuxatanavewa.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/92412745069.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_off0000a85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA85C 4956 bytes
SHA-256: d0d1b99cd892f9c36b45dc5f93fb764041a7542058b5a21a03adca4e6a4f215c
font_01_sfnt_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 8692 bytes
SHA-256: f527e2f3f7b3987475a2ade4f7ecbe96b10a355e1e6b9c2a6c8e39751553de64

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