Malicious PDF — malware analysis report

Static analysis result for SHA-256 5433aaf334818c4a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-28 00:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 270585cb7633e34936ee905994cdda2b SHA-1: 7afe2d56e6dc7d256f9fa05e8eb209fd3bedb819 SHA-256: 5433aaf334818c4a1d205fdef69a84cd7b3d27a8ef2dd1706b82080e2223aee1
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to other PDFs hosted on file-sharing services. The primary URL suggests a lure related to product pricing, likely intended to deceive users into clicking through to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=best+price+bosch+300+series+dishwasher
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/01051.pdf
    • https://cdn.sqhk.co/givesaxi/Qjb9ic9/fallout_shelter_online_english_release_date.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/52081d8.pdf
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/dabe298.pdf
    • https://cdn-cms.f-static.net/uploads/4393370/normal_600bcae80175e.pdf
    • https://cdn.sqhk.co/kuzaxepigi/fcggaja/zedge_ringtone_app_for_ios.pdf
    • https://cdn-cms.f-static.net/uploads/4422658/normal_6016034187e7c.pdf
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5ff9c8bc88ff9.pdf
    • https://cdn.sqhk.co/jirudumom/bhiyij5/nwn_barbarian_fighter_weapon_master_build.pdf
    • https://cdn-cms.f-static.net/uploads/4369794/normal_605fae73bd7a3.pdf
    • https://cdn-cms.f-static.net/uploads/4427094/normal_6052323b5fc11.pdf
    • https://static.s123-cdn-static.com/uploads/4384154/normal_5fef50b690798.pdf
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fe012b0e2b45.pdf
    • https://cdn-cms.f-static.net/uploads/4418167/normal_6041e515c01c2.pdf
    • https://cdn.sqhk.co/kupovite/SgcKwr8/niwobaxebogipaz.pdf
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/fulekenitene-sefab-rasazijakuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5640683-d3d2-43c2-ae71-790c828ba0c4/82959537855.pdf
    • https://uploads.strikinglycdn.com/files/ece64308-3db9-4312-bdc5-0e35b3520df2/49004893170.pdf
    • https://uploads.strikinglycdn.com/files/d52ef16e-49b7-4f9b-97f7-708f507a7ce8/37224507003.pdf
    • https://uploads.strikinglycdn.com/files/a3e2b3af-a6b0-4693-9555-bffe3c006d68/bujula.pdf
    • https://uploads.strikinglycdn.com/files/c834bd42-4b46-465f-bce3-e560796a9525/94212572529.pdf
    • https://uploads.strikinglycdn.com/files/2489a80c-900c-4baa-9cd2-604dd76bc48f/nkjv_audio_bible_gateway.pdf
    • https://uploads.strikinglycdn.com/files/c729d109-fb4b-44e8-9acb-ec5093365868/guseter.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_off000107d3.bin
891b4258f5b5b8f2ef61d2631b873acf82d482cfd86bd45377c3eab13e80f943
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 5716 bytes
font_01_sfnt_off00011b49.bin
877f81db5e40fe1ba1987f49bed5b12d474abb3cc2f196e40d6e19e6376bd521
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 11756 bytes