Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ae76879ecb450f…

MALICIOUS

PDF

58.3 KB Created: 2020-11-19 00:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d13f8d9f3392dd858c90766934b42db1 SHA-1: 1e577fe57b3ee7777c64834c848d3fb4356ee7e8 SHA-256: f1ae76879ecb450f5a3a552d9427fecb65fcb1c1b03aa7958db8458d0e594a26
156 Risk Score

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 0.9994

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://traffking.ru/123?utm_term=oak+park+library+hours PDF link annotation
    • https://rutukesusejam.weebly.com/uploads/1/3/4/4/134464581/zusivokivunos.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/9649503.pdfIn PDF document text
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/rufenamudeziwibifij.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/bokofapig/24772773093.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/fapazuvepudedisixafije.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/cnusd_canvas_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1696b9d-1b92-4be5-9beb-bead0f1463ba/81988251541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37962cab-6960-4a68-9292-9065f88619f0/21235199623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18393b4-80b7-40f6-9081-a6490f259291/gejudigunorupu.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/dietary_guidelines_health._gov.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_off0000a866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA866 5240 bytes
SHA-256: 19261a03ca110d168e0086a38218ab838c974c0581d720e82704e367ae6aa779
font_01_sfnt_off0000ba2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2E 10184 bytes
SHA-256: d33ba7d78d5d19a6643d8441bbe0fcc84e5c0b002089ca9321ebd7c4bdd105a9