Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd61953e010ec7e6…

MALICIOUS

PDF

141.1 KB Created: 2021-03-24 21:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 958e45f8a81bf27a62b26356cfb049bb SHA-1: b5650fa6d131d6a3d8eb04c01ce4ca4265f8835d SHA-256: bd61953e010ec7e6d0228eb7d4c5cf5bbbf305811ff0009b70134993bcd6c6b0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=kannada+janapada+songs++2018 PDF link annotation
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/vowagagos.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/wigupifov.pdfIn PDF document text
    • http://huseyincanx.com/watodol2iej1.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/less_than_zero_full_movie_download_in_hindi.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/taluxuramefuv.pdfIn PDF document text
    • http://salonly.xyz/the_norton_field_guide_to_writing_4th_edition_2016_mla_update2lywl.pdfIn PDF document text
    • http://useporte.xyz/inductive_and_deductive_reasoning_quizx1vj3.pdfIn PDF document text
    • http://begdas.space/nusapetelumuleguzewbecq2.pdfIn PDF document text
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/feluki_jabewevawanufob_megijusitepa_sulofokoxetuzew.pdfIn PDF document text
    • http://goodsfor.life/494546138168km9i.pdfIn PDF document text
    • http://aov.one/tiviralarrdj9g.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/bokisi.pdfIn PDF document text
    • http://gazuravalo.iblogger.org/wamigonisufuxebigos.pdfIn PDF document text
    • http://cparta.moscow/tarzan_cartoon_full_moviepi988.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/after_effects_free_templates_weddingr18c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabixukavizom.myartsonline.com/life_after_death_novel.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_21eacfa01a784426ada6fa12b3ee7e23.pdf?index=trueIn PDF document text
    • http://bevasisomari.epizy.com/95154418366.pdfIn PDF document text
    • http://mazebekivizaded.rf.gd/10th_class_math_book_sindh_board.pdfIn PDF document text
    • http://mojenuj.atwebpages.com/nucleophilic_aliphatic_substitution_mechanism.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_8e6d355dfd79401aa3029b7e7ce5cdab.pdf?index=trueIn PDF document text
    • http://navefifidarep.epizy.com/jabizazobotuditigu.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_db85ab02275f4949a503ee3ecf252ee2.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_off0001f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F03A 5564 bytes
SHA-256: 021d2df282655f93ec20682f31e75d1c0999357db7a7b0483d7e94e6319f3c11
font_01_sfnt_off0002034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2034E 10912 bytes
SHA-256: d5039eae03ddcf70d54335c4603b59166de92803ac4d44f15cc94b0224438d4c

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