Malicious PDF — malware analysis report

Static analysis result for SHA-256 c643f977d748d123…

MALICIOUS

PDF

92.0 KB Created: 2021-03-09 23:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 689c658927c454d786d87d6910cda6dc SHA-1: f22d91ef2405554cb5e2b42c0a548fb055de97f2 SHA-256: c643f977d748d1234f1ae87498260ac3d2e7e2261d033ac0f42a742a95fb90e1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru', suggesting a redirection to a potentially harmful site. The document body, though heavily obfuscated, contains references to 'Barron s new sat book pdf', indicating a lure to entice users to click the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=barron+s+new+sat+book+pdf PDF link annotation
    • https://cdn.sqhk.co/xelalizogim/dvbjhTP/2867094236.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/4879257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369494/normal_602292a465d6f.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/sasubageka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_60191e57372fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412391/normal_5fcd905196ef5.pdfIn PDF document text
    • http://funusiwevig.22web.org/free_autocad_for_android_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/1zrUoja/dipomexo.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/8462152.pdfIn PDF document text
    • https://kevesotajomuvow.weebly.com/uploads/1/3/5/9/135959451/7c2c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fd298bee5c41.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/T3Zhhgj/18880505664.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/Pijgmha/japan_basketball_scores_live.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/hiHcU3v/zejuvelax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86322b3e-6e98-4adf-81e8-cee843bef2c7/nufoziditilaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d360e801-7792-43e8-8204-d8af47e69ed3/dungeons_and_dragons_rpg_de_mesa_online.pdfIn PDF document text
    • http://tolerikaduvutef.rf.gd/craftsman_12_bandsaw_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c540a892-b86c-4a9e-81de-0271891ee475/goguzi.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/sat_hawaii_test_dates.pdfIn PDF document text
    • http://jadabizufugiba.rf.gd/fun_riddles_and_brain_teasers_with_answers.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/vaziposedokiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91778210-9559-4336-97ef-0b76ae6a41a4/ditokikidakujovofu.pdfIn PDF document text
    • http://nimunofat.epizy.com/iron_jawed_angels_video_guide.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/vozivujuviwufenowika.pdfIn PDF document text
    • http://mafekebokidodat.rf.gd/vukoridonizi.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_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 5348 bytes
SHA-256: 5af7b05959fed5b197ecdb7ff9438d760401a9a859ddbe9e6342f7229409a17f
font_01_sfnt_off00013eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAA 10424 bytes
SHA-256: d2e2e6ef9b48c78dfe5b933d4632a0f5e3a5fa62f1dcccb15fc5638755c936fb

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