Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfb71bfc8a8f8d1…

MALICIOUS

PDF

80.1 KB Created: 2021-01-28 07:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ead10700f410963234a05a5cfe3e2645 SHA-1: 9b0c790f3d9fd46f3ad2672cb2103ebecd4d8b4a SHA-256: 1cfb71bfc8a8f8d185c5d5da7caec378848f6465eab5c7135a1a0691f6dde639
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://maypoin.ru/wb?keyword=commander%20legends%20commander%20decks%20armed%20for%20battle PDF link annotation
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/0521698.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/ighcDji/63142191752.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/DgejiAp/75414778357.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gx4JaLd/airplane_movie_online.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/TQgihMM/kumexalexinazedopof.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/gcIgicz/67992636500.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/ck9AdCB/35246716221.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/Ajehchb/sprint_drive_password_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/jAjaOPo/anime_girl_alarm_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/bXgcqig/pitoda.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/5421928.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/6819699.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jchbQij/amc_mobile_movie_showtimes_edinburg.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/3043803.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/igjhCgf/barezelenulifijofufufema.pdfIn PDF document text
    • https://powilumoratome.weebly.com/uploads/1/3/4/3/134368047/5b91a2b.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/hcgdojg/pet_shop_master_blumenau.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/zobazimulawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxumev.epizy.com/muburepajita.pdfIn PDF document text
    • http://rodever.rf.gd/possessive_pronouns_worksheet_for_grade_3.pdfIn PDF document text
    • http://faxanudof.epizy.com/koparamigomibijom.pdfIn PDF document text
    • http://fewuzefar.rf.gd/denofej.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_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 5452 bytes
SHA-256: ba19c77fe11ef8500820ba741f5d714cedae88b7ce8a4e3d698a6e8bd8ae4cd0
font_01_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 11460 bytes
SHA-256: 6ea25fff5568601e0fb220c7e572c1ad00d20602a76e4901718630f65db44f2c

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