Malicious PDF — malware analysis report

Static analysis result for SHA-256 a410237bd86bbcf4…

MALICIOUS

PDF

106.4 KB Created: 2021-02-28 08:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d738c09647d7855436314bcd38d95ae4 SHA-1: d194e2493093175501acf0c94d1a95b20e62e313 SHA-256: a410237bd86bbcf47836651636783bae98ecd835038bcce9e807ef8fa038e18e
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDFs hosted on disposable domains, likely as a lure for phishing or malware distribution. The presence of a 'download button' heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://zajinet.ru/wix?keyword=bdo+musa+gear+guide+2018 PDF link annotation
    • http://korecos.ru/difuxapefilevavigunikejl53n.pdfIn PDF document text
    • http://krokoboko6.xyz/preschool_mom_worksheetsba17s.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/kafezej-jifidixeki-newoxepefekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/Uuhjfih/mountain_car_drive_download.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/resijiw.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/gofowexivetezokezi.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/8046991.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/hejjchi/33673452686.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/what_my_default_router_ip_address.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/MbDjgRo/17878100305.pdfIn PDF document text
    • http://midopan.iblogger.org/98077222624.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/xaxugabirevuzdd43p.pdfIn PDF document text
    • https://cdn.sqhk.co/xarupozikala/jchihfK/nenasiwitupo.pdfIn PDF document text
    • http://winnerslm.space/62280879466pgdpk.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/2778292.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/KAjcm8q/travel_checklist_app_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijumepalus.rf.gd/sivirodaziwirov.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_off000165ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165ED 5684 bytes
SHA-256: d7ad234a64e5ccb692b65d6d1b3232c465f545d385d2e7e559f13781b94355ca
font_01_sfnt_off0001792e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792E 10440 bytes
SHA-256: 3bdd049836214c0a79adbd1c63a55dd9d8d15a12488c171e082a59d11ce65096

Open this report in the interactive analyzer, or submit your own file for analysis.