Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb477127cc6d49a…

MALICIOUS

PDF

80.2 KB Created: 2021-05-08 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dd35f12b01e34663f86c83fcd7855dfb SHA-1: bd6372e5bcceb337c7ee749efb9bfa1bc2675f01 SHA-256: ccb477127cc6d49ad5d1ac3053e00383783c58f924c4bc9a3ef0d41ab0f27e5d
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-confidence heuristic indicating it is a phishing lure, specifically using an SEO redirector to disguise a malicious link. The embedded URL, 'https://fokemale.ru/strik?utm_term=sat+math+practice+test+answers', is presented as 'Sat math practice test answers' in the document body, aiming to trick users into clicking it. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=sat+math+practice+test+answers PDF link annotation
    • https://cdn.sqhk.co/xuwolupenilu/aJjezPn/iphone_4_cydia_apps_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/aRjhKFI/kesezifosinudanutuwumefa.pdfIn PDF document text
    • https://cdn.sqhk.co/wapogade/X1jdDcv/kmspico_ms_office_2013_activator.pdfIn PDF document text
    • https://cdn.sqhk.co/guzupewad/vgegxif/didotefuxodiwuribiv.pdfIn PDF document text
    • http://zolomakowifop.iblogger.org/belajar_akuntansi_perpajakan.pdfIn PDF document text
    • http://notanowid.22web.org/wusikogi.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/52c90d90-c12f-4b93-a914-ec826a20a612/79368838559.pdfIn PDF document text
    • http://keputeka.epizy.com/63291719626.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/is_the_new_dog_man_out.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/nudexelukemuxofofivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b12e853-32fa-4f06-8318-09b7656c36dc/how_to_turn_on_ryobi_trimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/fukeviradak.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/xubiwifiliwuxofowosofoto.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/trade_association_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace5ac91-17c8-491d-9d89-d133a86372e0/how_to_get_a_hardship_drivers_license_in_arkansas.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/bobasugiporodipusavu.pdfIn PDF document text
    • http://limulusukad.rf.gd/cute_babies_photo_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58092f26-9b23-4616-bc91-b190e6b96823/90738310187.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/jokorewo.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/ill_be_gone_in_the_dark_documentary_review.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zoposodadipajikebifoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a760d4e6-e077-4c80-8c74-4f3ad7e44c2f/rozuvif.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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 5336 bytes
SHA-256: 1cd49868856a939dd86248c23fa6d2ace42dcf779db3120214fe1acdc8f36eb5
font_01_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 12364 bytes
SHA-256: 966c9814f9dbdf0e0a0c98755dece10bfed13cba2c77aee3fc0b780449cae404

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