Malicious PDF — malware analysis report

Static analysis result for SHA-256 967da59fdfc5c31f…

MALICIOUS

PDF

70.6 KB Created: 2021-03-31 00:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45e981f8c774d90db2f505684bda5901 SHA-1: d0388bc6ababfb18b690cbb00c2f4d3c87913b44 SHA-256: 967da59fdfc5c31f0ab57e1d971a90957003fd6bdcca63aaacd1c1d99b986abd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, forming a link farm, with the primary URL being `https://lozipotod.ru/award?keyword=cessna+152+maintenance+manual+pdf`. The presence of a link farm suggests an attempt to manipulate search engine results or to distribute further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=cessna+152+maintenance+manual+pdf
    • https://gufubavofunopi.weebly.com/uploads/1/3/4/7/134704705/5341126.pdf
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/2737292.pdf
    • https://static.s123-cdn-static.com/uploads/4378171/normal_5fdcaddbd0cb4.pdf
    • https://cdn-cms.f-static.net/uploads/4446772/normal_6012ff1f3182c.pdf
    • https://cdn.sqhk.co/mixaluwekitu/3t3ggii/hotels_with_kid_water_parks_near_me.pdf
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/wajamota.pdf
    • https://static.s123-cdn-static.com/uploads/4377647/normal_60068eba458ee.pdf
    • https://cdn-cms.f-static.net/uploads/4368750/normal_601b3e70c44ab.pdf
    • https://cdn.sqhk.co/maxanogefo/YJiaicH/22821551551.pdf
    • https://vokipokulolobu.weebly.com/uploads/1/3/4/0/134016984/kutotabubuka.pdf
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/bufamoju.pdf
    • https://cdn.sqhk.co/tibatojo/h7jahf3/53098123566.pdf
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fd637fe25a91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_ed6196a5b80b45108d322271201d8a6d.pdf?index=true
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_d2231914986e448890835d7b3460a37d.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_d1b2d88e74d84faeab3740d14e9f636f.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_deba17952ea64d1d951cac213015d7e7.pdf?index=true
    • https://s3.amazonaws.com/xuzed/amr_diab_tamally_maak_music.pdf
    • https://s3.amazonaws.com/guvovigo/95676087257.pdf
    • https://s3.amazonaws.com/bufexa/wulewutugedosuti.pdf
    • https://s3.amazonaws.com/kibavutibeved/imparfait_vs_passe_compose_worksheet.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/wepatilofukexig.pdf
    • https://s3.amazonaws.com/zalisujezajaje/50021582893.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c0.bin
58567bdfd564b493dedbbefacd05089e2c71140c43d86d28822b0f2323e85db8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 5420 bytes
font_01_sfnt_off0000e729.bin
c4b7cb2e80a873dbd7c744c9c80c09135eff5dc3483b7b2202f1a5e6b8369ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10624 bytes