Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf4b38af8d70510…

MALICIOUS

PDF

95.6 KB Created: 2021-03-24 08:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eee0203288165338378c452b45c89c56 SHA-1: 88e77ea19e02872a39ad84f8b23ed99029e92a1b SHA-256: 4cf4b38af8d7051054d9fc0cc37319169f2f92ec8574232a35e1f3f56c169708
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to lead users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/wix?keyword=usatestprep+answer+key+science PDF link annotation
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/pajufebenoweguw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_60269f19197b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/eLgcIcI/49022219683.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/944c0bdac4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/cijMY9I/hockey_playoff_predictions_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fddd28eb3adc.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/58ad2.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/gheeihM/wododuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/dg6hfut/block_breaker_game_for_pc.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/xewipazebi_lonet_fowev.pdfIn PDF document text
    • https://cdn.sqhk.co/vurifozi/hifiajj/fall_guys_game_free_download_for_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fcbab9861039.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/eggajtD/adobe_acrobat_xi_pro_free_softonic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fd7de5b9179e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fcdd5c23ae9e.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/NACNibP/chess_openings_black_knights_tango.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/xupizewuxere/bifumawadedesemif.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_2393120fc55c4cdba0730dbe5986f818.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_26af0c79d11b43c39ca335c91d79f635.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/denezebotagenanog.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/xofawiv.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_bd3af62ddf7d41dca0d530c2f3aca31e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/credit_bureau_reporting_false_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/2456090036.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_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 5144 bytes
SHA-256: 2e00fc89d9549359c7a3b08c80d3c36bf3b6a5317d01741219f233efecb5c7a0
font_01_sfnt_off000140dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DC 14516 bytes
SHA-256: e8dd30c56f8f827a6490351503072bc05b0d154dc8fd49708a73049f30d915c0

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