Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b826d86eb35fdaf…

MALICIOUS

PDF

95.3 KB Created: 2021-03-17 01:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 635863e981774fd08ca0f317314d2faa SHA-1: 19857d968656502ff8cf384c458cf5c29b329965 SHA-256: 3b826d86eb35fdafd3f92be904e108a4ddbbac244cd46c485ed09f01c77786ac
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm designed to attract users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=absolute+beginner+s+guide+to+minecraft+mods+programming+pdf+download
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5fd8d1b36d407.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_601466801ab27.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602615f202531.pdf
    • https://static.s123-cdn-static.com/uploads/4477878/normal_5fced569b7ee3.pdf
    • https://static.s123-cdn-static.com/uploads/4384836/normal_600550ec416e8.pdf
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fcb34c96fe7e.pdf
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5feb8066dde5c.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fd771bd5d84c.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_604e6dbf8548d.pdf
    • https://static.s123-cdn-static.com/uploads/4408586/normal_5feb692aabba0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://00815d84-8c17-44bc-979d-ca542bc379f7.filesusr.com/ugd/0182ef_461c6368926f46ccbe25c3283caf782d.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_2f4dc10504484a8499c20c14ba91f2b1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ad932ef4-3a49-4b85-abfa-4c58494e2f6d/windows_server_2016_troubleshooting_guide.pdf
    • https://uploads.strikinglycdn.com/files/8987f664-6e8d-409b-9cd3-f60aee85a6e1/vupidudozisofewe.pdf
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_d63fe930b80e41a2b94cdd8ccbce23b0.pdf?index=true
    • https://s3.amazonaws.com/begijufadi/16552861321.pdf
    • https://uploads.strikinglycdn.com/files/bfd9abd7-6fb8-4004-b1a6-c827e537f1d6/38570530305.pdf
    • https://s3.amazonaws.com/fipijife/interpreting_graphics_worksheet_answers_chemistry_13.4.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_13f874b4e2a342439ed6894f71063c2f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/320eb074-a3be-4e94-8ba3-3bd3ace81394/can_you_buy_black_ice_r6.pdf
    • https://uploads.strikinglycdn.com/files/0d1cd90a-5e0e-45fc-b9e0-86ae3e5bd354/rolaxim.pdf
    • https://uploads.strikinglycdn.com/files/39379327-b79b-4b8b-9f6f-f11ca5b456d6/us_army_uniform_for_sale.pdf
    • https://s3.amazonaws.com/xeroguru/88884485351.pdf
    • https://s3.amazonaws.com/bajapovogam/41989576530.pdf
    • https://uploads.strikinglycdn.com/files/ca9d603f-a7b2-4666-b4f3-8e529207a0d8/crochet_bag_pattern.pdf
    • https://uploads.strikinglycdn.com/files/2b27b750-3850-4d64-95e2-10ae10c08f86/roomba_980_battery_charge.pdf
    • https://s3.amazonaws.com/mejobu/2018_ford_mustang_shelby_gt500_super_snake_horsepower.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_136d3611cb23494ebad3974cff2acfc2.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012884.bin
93c1ba12329be4396c74c9ff23fb47a348e73718919f8ec4cf8dab3158d3b604
pdf-font-stream PDF embedded font (sfnt) at offset 0x12884 3140 bytes
font_01_sfnt_off000133d6.bin
30f0076c404a80702ed336c6f7fed6079bf1cfdfffa367814eaa7ff7625c880f
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 5696 bytes
font_02_sfnt_off0001472c.bin
e40aef67db1caf36236ec42acd3968e0efb9c4fb6a94e9d99ee5d4ddf4346682
pdf-font-stream PDF embedded font (sfnt) at offset 0x1472C 11352 bytes