Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81e2a3345aed725…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 11:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 841710832d1453efc550e3142c7a4ed9 SHA-1: b552f8eb70f1a6beca1818816c9d1eebd6ea4490 SHA-256: e81e2a3345aed725d3e04dcacd02ec3a2b5143c971d766471b4d8fd672db150f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=10th+class+maths+solution+pdf+fbise PDF link annotation
    • http://rotirir.mypressonline.com/broteinheiten_tabelle.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/what_is_the_meaning_of_down_the_rabbit_hole.pdfIn PDF document text
    • http://gatigade.iblogger.org/parliamentary_and_presidential_form_of_government.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/62241579310.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/pejabejepasojote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_ed778d26b4c44036a4e912603ac68247.pdf?index=trueIn PDF document text
    • http://rakimeramut.epizy.com/73529994518.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_b162d350c12f4a35ac8818db49b8e24e.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_b9b48f5218774e999358231366c49e5b.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_abdb859672a84bf781e3cb36c520440f.pdf?index=trueIn PDF document text
    • http://sugunava.epizy.com/lg_tone_infinim_wireless_review.pdfIn PDF document text
    • http://jimibidubarabus.epizy.com/digi_002_rack_standalone_mode.pdfIn PDF document text
    • http://gexefafuli.rf.gd/pajewamapilomixit.pdfIn PDF document text
    • http://wegudewabeko.rf.gd/series_of_unfortunate_events_book_1_chapter_summaries.pdfIn PDF document text
    • http://bolatufor.epizy.com/battleship_war_game.pdfIn PDF document text
    • http://sepobifesedapeg.rf.gd/suporizukisi.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_f89c43fa8f6c470e89ed69de97475369.pdf?index=trueIn PDF document text
    • http://kubitilabevovup.rf.gd/12394921613.pdfIn PDF document text
    • http://fupuzujovo.epizy.com/sevoko.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_2fce4291f18a4768a5937d6dec707662.pdf?index=trueIn 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 5536 bytes
SHA-256: 7c0ad2fcf838997d0237c19ee5876f85c699711f2aca62f7c937884b6ddfc90a
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 10640 bytes
SHA-256: dfe7030a91f1f60576597a06049ece1f6b16bc3632c5010bab204f89302cab7f

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