Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdf843bccba34d2…

MALICIOUS

PDF

134.2 KB Created: 2021-03-25 15:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a29a0af3e3415af12f9e18574d88023 SHA-1: 977ab49e486851f84e9612103f0aa3a3dd61e1c6 SHA-256: 4bdf843bccba34d2fe8afe7a40c2eacd9bbb7188cd4b943bbc62a3a4457a9bd6
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results for documents like solution manuals. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests an advance-fee fraud scheme. While no scripts were directly extracted, the presence of external links and the nature of the heuristics indicate a phishing or scam attempt, likely leading to a malicious download or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://vilenefex.ru/wix?keyword=accounting+principles+12th+edition+solution+manual+chapter+3+pdf
    • https://cdn.sqhk.co/zasokolof/heejhhc/jonutuzedakazigezabuvamu.pdf
    • http://xosuxifareg.22web.org/29524853370.pdf
    • https://cdn.sqhk.co/lebudawojafi/jmqW0ja/bootstrap_form_horizontal_left_align.pdf
    • https://cdn.sqhk.co/dijowasedop/gfQJBha/napivolumamijafolav.pdf
    • https://cdn.sqhk.co/mitukutowum/bFicgeN/hearts_of_iron_4_cheats_equipment.pdf
    • https://cdn.sqhk.co/loganidob/hciehiH/super_ninja_virginia_beach_coupons.pdf
    • http://gomakugagazeg.iblogger.org/19268663183.pdf
    • https://cdn.sqhk.co/bujasugawo/jcl6uJ5/siruzukarosuz.pdf
    • https://cdn.sqhk.co/teposodigar/jaYjjhf/nitevekuporijuxip.pdf
    • https://cdn.sqhk.co/xasexuwosul/XieyclS/76108497877.pdf
    • https://cdn.sqhk.co/nezuxada/j8w6117/52272103545.pdf
    • https://cdn.sqhk.co/remimidotomi/dicpihU/96614073574.pdf
    • https://cdn.sqhk.co/wedegetuso/eOhbidU/nfl_cardboard_cutouts_price.pdf
    • http://vefaporuzudu.iblogger.org/34713384171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0dc58386-121f-4e47-be4c-bf3f13d1e6ba/corsair_gaming_k95_rgb_platinum_cherry_mx_brown.pdf
    • https://uploads.strikinglycdn.com/files/44d6ab5a-1917-4e3d-938b-5e4a71d23458/2011_rav4_v6_oil_type.pdf
    • http://wumewexowemuju.rf.gd/common_idioms_with_meanings.pdf
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_e33f9ddc0e9c4925bb7f30f40f4c7d6c.pdf?index=true
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_daee7bebd6844e65a94ccb5ba701977e.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_15dc4867beb649bc98fdc0068bd9e342.pdf?index=true
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_54fc438f048a45adb7dd1fe2fb2ba1a4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd99a82b-c436-47e1-a3f1-66322384a55a/rovutavozepunupoz.pdf
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_2b00b4767ff64cc0a8b38b91167696d1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb37.bin
1509189da399969eb95a473c67abc1de315c10bb689e07724b48b81495ddc548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB37 5908 bytes
font_01_sfnt_off0001df32.bin
3560ed02fbb1294ecfe2de06b327f8d97ed5b8777fa597f7a3963e08543def42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF32 12128 bytes

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