Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f803fdab64003d7…

MALICIOUS

PDF

111.1 KB Created: 2021-03-17 16:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ebb9eeacfff895208e8f023a7bcdbc40 SHA-1: 55321ceb160fa9dcbdbec69eccb7f507166bc95f SHA-256: 5f803fdab64003d79de4951d46ffe38a3e9c22167ee7de986273fabfe738b7ee
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 hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=longman+academic+writing+series+5+teacher%2527s+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5fe854c7df340.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/sotalux.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/5b264169ba13.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/1019861.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/xekujaberaze-muxeribeviwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5ff800c224886.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/9eea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389576/normal_5ff867a2d1606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6046d8742f95a.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/0940797a-397a-4763-bc0e-ac40c569b544/namadusojukes.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_c00cb738349444da81b848a6ac286a9b.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_864ecc3287f14c61b9fb9f8849954bcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b656f3d0-dd37-49f7-8536-27ccdba15244/the_witcher_season_2_episode_1_release_date.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_c6bf1a0971bb44ff8d0280d5ac47c76f.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_290be1ef55f248d2ac102a6f9287cfdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/705fbd36-a342-4b24-8fad-03b56cf8c044/is_blood_bowl_2_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cbd5c3-a99d-4088-a24c-722a6c734322/7772252858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f75f7f2-d315-4bbd-8b13-2dab316cc43e/the_raid_redemption_movie_download_in_tamilyogi.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_off000176a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A9 5760 bytes
SHA-256: 862dca51ce31bcbaa5594e22fb398cc3b0051aa7fb252b58cf3fba932205c84a
font_01_sfnt_off00018a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A3D 10592 bytes
SHA-256: ad2477f7d87ab24264aa1804d7a9a8c39be50abaec247fe7b01c3a7c28b5440e