Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d76f218f1a661…

MALICIOUS

PDF

75.8 KB Created: 2021-01-03 15:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d30dac9f2bab133f3355d343b312c4e SHA-1: 731b9ec6b34d0fc5e99403bd926905824dcb04e8 SHA-256: 815d76f218f1a661f2cbdd81b7d113440f6b7b2c16a1d62a2942bfda2f87e0cc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a "PDF_SEO_LINK_FARM" heuristic. One of the primary URLs, "https://trafffi.ru/123?utm_term=step+by+step+mixing+pdf", suggests a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/123?utm_term=step+by+step+mixing+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402289/normal_5fde813888b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f9ef687d4909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_5feec95de82fa.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/xamubewijugikowonaw.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/fbf9cecac08a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5fd281a30745d.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/nefesonelupebi-dedexufimap.pdfIn PDF document text
    • https://razesune.weebly.com/uploads/1/3/3/9/133986972/sowefolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe463dd38eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8965552962a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5fe38404e2d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f8a0d0d3abcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fc60a2e3298e.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/zelubowimu_divokevig_mimotolaf_zajax.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/novifamigot/chakras_for_beginners_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7742836-0a0c-4611-a177-131a37ee94cf/zupokow.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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 5436 bytes
SHA-256: e71d67bda6b251477f6b2b974c81883992b7b716226980255c55599cdda88e1d
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 10784 bytes
SHA-256: 5ba94838432128c1671016911a129dd23397bbf28cddd0d13a9aa24c9b750b7c

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