Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78784f631ceb45e…

MALICIOUS

PDF

83.3 KB Created: 2021-02-24 06:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4fc3d3df5700f2cbd72d82a82c778c5b SHA-1: 4f3eb1a595eb1bd837601725cd88356802cf4bd5 SHA-256: d78784f631ceb45e9863c36451231eb83d67e50fe90765dbc7ea70677d6e3ab2
134 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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain associated with phishing and malware distribution. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious. The presence of a 'download button' lure further supports a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=graphic+art+design+jobs+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fd03af5cae5b.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/gdWSxLj/amtrak_train_14_on_time.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/ghSgcib/first_grade_math_activities_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5ff9ec5e5ecce.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/dVq4kn4/tangled_the_series_rapunzel_age.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/10387751264.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/TbYQ6ib/48037554982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fcd78b6f07ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5fedb9db254ca.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/gcKoaVX/78118938896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadakivok.rf.gd/landforms_in_south_america_map.pdfIn PDF document text
    • http://setowibuvi.epizy.com/fan-tastic_vent_model_3350.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/77808634049.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/aptoide_for_computer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/vutiropamilomewavuxar.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/mario_kart_tour_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/xikuwadoru.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_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 5700 bytes
SHA-256: 0b008e1ed806b2a02af5a047ce7ddbe34872ba39a45bb66a08f004714f0765fa
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10812 bytes
SHA-256: 656829f237b2f00d08e8dcaffbbc55fdc2d188963f2ef4b7813277cd45967a36

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