Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d97bbc401d581ef…

MALICIOUS

PDF

88.7 KB Created: 2021-02-24 08:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d369e98d1293cdaea3bcb4d651d47ff SHA-1: ce5dfb008a288e1051e25439cca54291f566184d SHA-256: 8d97bbc401d581ef7e0a32c5d68eb9b9383df9da5d31f4502d3de474bdb4a611
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'book synopsis' lure, indicating an attempt to disguise the malicious intent. No scripts were extracted, but the presence of numerous external URLs points towards a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=cirque+du+freak+book+synopsis PDF link annotation
    • https://wewokidopubix.weebly.com/uploads/1/3/0/8/130873978/vixijugod-wobiba-zarijibibi-fiwonesuwoparev.pdfIn PDF document text
    • https://cdn.sqhk.co/dumoniriwo/ie4hggg/sweet_boy_baby_photos_free.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/aq0iJhi/zafatonupewovevejexatagaw.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/gchci6Y/lazirugasuseb.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/6487328.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/lib4ibn/visusokunos.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/7765981.pdfIn PDF document text
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/filokubodugugeref.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/gisenugata.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/muxafozorekijajeforon.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/hwickjd/dowagobowijokixiguvom.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/avughgf/vidisiwesepexaketijimaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/chaojdo/52511857163.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/Giiajjh/31722767469.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/jexibigi-xepupaxugaxal-todudukubije.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/Whjhbq4/badlands_national_park_weather_radar.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/mibotubo.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/Igciaig/stickman_legends_of_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/idprkgh/dj_tiktok_2020_nonstop_offline_download.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/maditaxesadajor-faguvaduz-bevozu-motazaxobuzug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xatonidimo.rf.gd/gatusefumewafetaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 5260 bytes
SHA-256: 2973f8d434f14e14e3db4fa1eb1de61aa41465b3685c0064d56e07a86892b740
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 12396 bytes
SHA-256: cfb8273df62b2366a8b9f59a8ba11af1650dfb63814bd68673f2181289014e28
font_02_sfnt_off00014767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14767 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3