Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9597894e39740e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 05:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 11d277f6c39b8ade998a0bd5a65c67a7 SHA-1: c5bd250e1645be45988e126e5ec6b64ecaf4e759 SHA-256: 8b9597894e39740e6d32fe9ca1080d881d98e9a6e1c0ca59d4effcdc86bb39a9
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of commands that could be used to execute malicious code, and the ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/wix?keyword=trane+wifi+thermostat+installation+manual PDF link annotation
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/f68589823.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/ff8f993902770.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/windows_powershell_ise_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5fdf548a4e8f4.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/gtx_970_hashrate_monero.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/8c5963dc755635b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6047fb6266b42.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/c061b25.pdfIn PDF document text
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/porijivutekam-gojivixarozoge-zukejagu-rajaderela.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/78056256287.pdfIn PDF document text
    • https://uploads.strikinglycIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f51cf53-97fe-4420-b1dc-d90c60b77ef9/32493842188.pdfIn PDF document text
    • http://dujoserowumil.epizy.com/apics_supply_chain_management.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/b4520b04-3ec1-4e46-9f10-efc6bca3fa30/19612662520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e937b238-a9ae-41dc-a100-f0be23160fff/best_app_for_studying_the_bible.pdfIn PDF document text
    • http://gavofime.atwebpages.com/45243679977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289ff8e4-ef45-4572-83ae-0d96b2e81d9b/hydro_flame_rv_furnace_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3edb88-eedf-481f-832a-23fbd370c384/hp_envy_4500_not_responding.pdfIn PDF document text
    • http://vodirid.epizy.com/multiplication_and_division_games_grade_4.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_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 5048 bytes
SHA-256: 0c6fdbcbb9b6e021a7e94f5f2f431f6e7fcef66f76be2e0bd730db852717a104
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 10992 bytes
SHA-256: 72af144563807d8a4a3ff1c39f34af48fd51de7317c3a7b97a024c5deb115949