Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e91f22add51dd0…

MALICIOUS

PDF

87.6 KB Created: 2021-04-06 14:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6407f65eaa80a6e53b8268ad9c97e97 SHA-1: 108bbdf40b2c8344db7bc2b7c927ed6a3bc05cc0 SHA-256: d3e91f22add51dd0027de43d1ca7e92dde9881a78b3f1edf45dc321082d4590f
194 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. One of the extracted URLs, https://jacksth.ru/strik?utm_term=what+is+news+headline, is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=what+is+news+headline PDF link annotation
    • http://wififej.mypressonline.com/92086704788.pdfIn PDF document text
    • http://tiktokfrance.fun/official_badminton_score_sheet2lxvz.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/437f10e.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/network_anomaly_detection_a_machine_learning_perspective.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/40271989628.pdfIn PDF document text
    • http://copyright-security-ig.com/849108780088ide3.pdfIn PDF document text
    • https://nusimebafubatet.weebly.com/uploads/1/3/4/6/134685422/dunetuvoroxilis_bizuzamuv_lejanelo_renod.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/19637426727.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/dieta_cetogenica_argentina.pdfIn PDF document text
    • http://goodik.fun/jitijodvdn0g.pdfIn PDF document text
    • http://rufazezijew.22web.org/talujabowezozak.pdfIn PDF document text
    • http://gravkamen.ru/miss_marple_a_murder_is_announced_2005_watch_online5h8ll.pdfIn PDF document text
    • http://shortsomfj.space/2453319152r8rj4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_98ce46af12794c61be310c322adeca89.pdf?index=trueIn PDF document text
    • http://solarujarinobo.myartsonline.com/fifty_shades_of_grey_movie_songs_list.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_8252f750f3e248a78b0e651f3a42a0dd.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_3456256f24a34c868de385dc051d93b2.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_0d44fc815c9f4e30a106a5945f0b3793.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_05995c63ac364e75b09832868677ce59.pdf?index=trueIn PDF document text
    • http://faminosokaru.epizy.com/73912156957.pdfIn PDF document text
    • http://mugukogegib.epizy.com/bread_baking_book.pdfIn PDF document text
    • http://jegunabozoxi.epizy.com/39069807343.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_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 4924 bytes
SHA-256: 858c170fcf3ccfd21f57be11f04f8f697dc876499d2c1c5adac1b9dacec3a60b
font_01_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 11128 bytes
SHA-256: fe506fe9d8434be28ba71cf7453e373258f3b68240aff7c5fa34858e812139d4