Malicious PDF — malware analysis report

Static analysis result for SHA-256 723f1aa09781b9ac…

MALICIOUS

PDF

78.6 KB Created: 2021-03-16 19:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d1459dc22a03f0f8f776f91659bd74ca SHA-1: dc39cac80da12c801e3ae998c111561112cd1867 SHA-256: 723f1aa09781b9acfff549424ddbc75fddf2b6c88e42e6f0732fac78759e7f2f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains embedded URLs that redirect to external sites, such as 'https://kuzutuzo.ru/wix?keyword=dire+bat+mount', which is likely part of a phishing or malware distribution scheme. The presence of PDF-specific heuristics and the overall detection pattern suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious 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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/wix?keyword=dire+bat+mount PDF link annotation
    • http://waxedeb.getenjoyment.net/zirosefuvap.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/fii4mig/super_mario_odyssey_kingdom_adventures_box_set_review.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/bean_bag_toss_length.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/BhieEqi/learn_java_for_android_development_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/dioses_del_hinduismo.pdfIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_3fb97d779da445bfb3ddbf36462dc49d.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_7fc990785f7a4b899b75b30480538ec0.pdf?index=trueIn PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_dd5a7b7d799f4a7090458604da34872a.pdf?index=trueIn PDF document text
    • http://putowop.epizy.com/kitchenaid_ksm160_artisan_stand_mixer_colours.pdfIn PDF document text
    • http://jaxegug.rf.gd/sarah_plain_and_tall_movie_series.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_6a3f4fffb6f9459798ad58d94a1d90ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fopalew/rekimaragoputuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157e614e-9950-450f-8bcc-d3928a5cf198/what_is_atf_4_transmission_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/90810217074.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/rascal_mobility_scooter_service.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/duzigitorores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd041ab-8ed6-4c02-8129-548c67fc8503/dream_yuga_110_mileage.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/18104101280.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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 4760 bytes
SHA-256: 2f20e0bbdcc2b845a7da45f47ec2329f1be0a90469e6135f8e8ff89493c98c0d
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 11452 bytes
SHA-256: a8391d085f2818065d3be026186694033d81c1e033317d38103725f5e1e36ad6

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