Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc80b3c69b3c0303…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 02:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 297d490ae4e1776767211ad4194c824e SHA-1: 5612368288093756bc52c6c83909a990350f125b SHA-256: fc80b3c69b3c0303ae6fb4c90b1f23ce5198f46bed77ebf65a367331f75f0f3d
186 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 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/award?keyword=cabasse+auditorium+tronic+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/raguwubives/vijIZjb/52477460094.pdfIn PDF document text
    • https://felonuwonab.weebly.com/uploads/1/3/0/8/130814100/rosunag.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/r9gdigr/2687671668.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/jizakefed.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/5a7d2ffe5532e75.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/bca8e1e3f31.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/ifhfwjd/34969639651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8c4608ccd.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/8398898.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/igigngj/73337488291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fd296fbecd2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_5ff3304240cae.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jeNifCz/14754108093.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/gorajikunobixi/rowavuwisivid.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_5c7aeea87a2944e482fa02baf0de24cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/73890535294.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_60ac2ca269a1471b8cf2c3a9998be058.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_81093c6cf4d64601b536e3847abe52c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/6869418375.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/degefivipefosuvapiwe.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_7c973d533d084e879619e2413eadd5be.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_09fa0b9c60fc49958e68cda4124c6a23.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_6742b9a66e41478285f5913ab3512c90.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_c8431d317a764e82b565a489a2e4926b.pdf?index=trueIn 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_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5344 bytes
SHA-256: 49ba892636448bdf27675f1d1c0e49b83e42d6b4f0124f755d9c4c6ae7ea1dda
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 12172 bytes
SHA-256: 9900ad8f8e2c011f1318e7c44e9f38fd4d23d9dc0a4158ccf153de060dae8c97