Malicious PDF — malware analysis report

Static analysis result for SHA-256 601205d092cb7eb7…

MALICIOUS

PDF

84.2 KB Created: 2021-03-20 13:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 146f113ccdcf87dfeb8273e6d576e4e1 SHA-1: 5c777f76b137b116265ec5765ca61651aa729b1f SHA-256: 601205d092cb7eb74e49426fefb0cf8bce33ed2e49a28c11585728d83a9e9dda
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, many of which point to disposable hosting and are presented as links to test materials. The document body, though heavily obfuscated, suggests a lure related to 'English aptitude test questions'. The presence of external URIs and the overall structure indicate an attempt to redirect the user to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=english+aptitude+test+questions+answers+pdf PDF link annotation
    • http://braco.ru/4_step_problem_solving_math8tfmz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_6009f68e1f0a8.pdfIn PDF document text
    • http://podcard2020.site/98297349545vmxe4.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/renewable_and_efficient_electric_power_systems_solutions_manual.pdfIn PDF document text
    • http://medicalpracticementor.com/best_sports_video_games_2020_ps4pgmus.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/ccna_service_provider_official_certification_guide.pdfIn PDF document text
    • http://meinekarten.best/jeep_cherokee_shop_manualbaglg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5fdcae85eda72.pdfIn PDF document text
    • http://ludshop.xyz/tanzania_national_water_policy_2002ht0k2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_42a1ce9bff54457194cb531806dfe796.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_5caa1b3dddfe4b198ae8b3f6f43bcd92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/arithmetic_sequence_worksheet_with_answer_key.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_fef8751f8d1f468789115a55aaa31953.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_fcb5f7a2d6094e1f9c5852df1cf56723.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/gorumum.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/ata_chapter_51.pdfIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_3dd21c8af288423ca250ee7e6bdefdc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/maziwogupepita.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_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 5476 bytes
SHA-256: d13ca7bb3a174620437eb35b0b9217f921557579e1c6fa635ca1cfd5c5c4a17a
font_01_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 10956 bytes
SHA-256: e6e9689dddcbff47e3117a804b54605f31bcdddd02310284d53eaf779c1dfa18

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