Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bd378097554959…

MALICIOUS

PDF

89.9 KB Created: 2021-03-28 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ab2cd0ae996755cc48cce95348b56ed9 SHA-1: 6640790cdc527add0aee5e34e2d6f763c2101cd9 SHA-256: 42bd378097554959195c30f3fb658f686c33fc93e6cd676385c3b22ed21c3073
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=line+6+spider+iv+15w+1x8 PDF link annotation
    • https://cdn.sqhk.co/bojowagawire/HjfWtih/21163998754.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/jigS2ha/sunokuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/erZzxhi/masitiwaxexisun.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/jxJAu6p/dubifogavabazifexixujes.pdfIn PDF document text
    • https://cdn.sqhk.co/wepevuwu/Nl3gcjJ/xavunasexupikiluvelalujeb.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/hjXIhgh/aerial_duel_in_football.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/2ca550dd-036f-4e31-afa2-609f9d9d2810/kepunafuziponolipupe.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/rewubonozodomukupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8498b4d-ad8d-4c77-a18e-f0b37c4bc0c9/words_to_describe_a_pine_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/broomfield_school_enfield_ofsted_report.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_f02908bf419344d78a88502f4f15e255.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e03a03-4e7f-4bca-83d9-58857d8e887c/zagevovoj.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_ab1d4629f91b48b88accd85f29134808.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/virelak.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_c6f3c2103e20492498d3e8b11eed6d4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/996a5b59-e23c-41db-bef7-79187c57686c/napatubigiz.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_fd9756d58f5642798c63b448a91e4ea2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e1cf32-183e-4f87-a41b-adaa4b233946/ilive_under_cabinet_radio_not_working.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_3d5d4be9cf814819b274e11b9e5396a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70bc593-2d00-4102-986c-e29c48452a7b/lean_project_management_methodology.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_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 5396 bytes
SHA-256: 9658747b8bd184e5b608487795a060c4c083d659bd5b9fbc16537719bd0b8004
font_01_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 11692 bytes
SHA-256: 3b44a411f9498cf06cd8578e7ee007c7793102aef4199135863bf5d47dccb36e