Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f38df0fafe6809…

MALICIOUS

PDF

85.3 KB Created: 2021-03-31 14:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 755fdad2f288124ab98255b515086558 SHA-1: dbd99c7d9d23290a71fc21cefe77ac26cec03879 SHA-256: 85f38df0fafe68099c08de17c0852d1146baf05659fbd9c2ef47f81fd24269ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://golowaki.ru/award?keyword=apium+graveolens+medicinal+uses+pdf
    • https://cdn.sqhk.co/riketumes/Widhiaf/snappy_nails_prices.pdf
    • https://cdn.sqhk.co/bikegola/jjhdOid/gavobepuk.pdf
    • https://cdn.sqhk.co/tamaladafa/cghhbji/gitago.pdf
    • https://cdn.sqhk.co/sadirorig/I1gLjhY/notes_on_iphone_xs_not_working_after_water.pdf
    • https://cdn.sqhk.co/damukowabij/eWGjehj/witirizadibozozewareba.pdf
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5ff2d3ac5e32d.pdf
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fd9f9ff97023.pdf
    • https://cdn.sqhk.co/titesojijuko/gjjverL/nice_short_sleeve_button_downs_business_casual.pdf
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/2917189.pdf
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/bogexuvi.pdf
    • https://cdn.sqhk.co/vesagivara/xhirVgd/tepung_ampas_tahu.pdf
    • https://nugasoxitobaj.weebly.com/uploads/1/3/2/7/132710773/satakapu.pdf
    • https://cdn.sqhk.co/juselivo/bgegejg/11407987094.pdf
    • https://cdn.sqhk.co/kevovevude/1HYNjh5/outbreak_perfected_catalyst_puzzle.pdf
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/manitenififasezalij.pdf
    • https://cdn.sqhk.co/jenexovu/eVchikM/hungry_dragon_hack_apk_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4465010/normal_5fd7363cd24fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_f88557eaa03440d28d9aa7e1bb80c894.pdf?index=true
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_bffab35fb1ec4205944e7a0a8ff0cc03.pdf?index=true
    • https://s3.amazonaws.com/zopenave/62631352532.pdf
    • https://s3.amazonaws.com/dadupawo/vejogamijakijabudesomet.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_940a11db58374da39c0dd6f3734999e3.pdf?index=true
    • https://s3.amazonaws.com/tixeligufokup/64658967331.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa37.bin
003358414060aaa993c1b926d19d3e250c3eedd1d2823cb679c66f1ce2460076		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5524 bytes
font_01_sfnt_off00010cf7.bin
cc2d989da0dbf7ed8218362886a5fbb3395833831051a984ba056cd0d7d25ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 11236 bytes
font_02_sfnt_off00013248.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 16060 bytes

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