Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2a5708af2674d8…

MALICIOUS

PDF

83.9 KB Created: 2021-03-17 21:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b429812cfcd41403ccb539fbf4c2c82c SHA-1: b1d3b0f4a6824834381e0127e120c2ca1fe80cb6 SHA-256: af2a5708af2674d88a15917dc7746b269ff5f4fae058692320dee6b4325cdd7b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://lozipotod.ru/123?utm_term=genetic+drift+and+gene+flow+worksheet PDF link annotation
    • https://cdn.sqhk.co/lamijaluxeso/ejhidge/sivok.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/hZ3jin3/song_careless_whisper_songs_pk.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/hdjbjgi/vejuvekaleninasozuxerobu.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/poxiwedesaganitu.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/1343260664.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/aircraft_structures_2_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/bKianPf/43770104931.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hJWM1ve/53124203813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_1f680bf45be247308fbf896740d2be3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/vetasifepejudoz.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/35091957902.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/53429622499.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_0edbc04d7ed64e2b926004647af506bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/15370602449.pdfIn PDF document text
    • http://jazopizebe.atwebpages.com/zifujepomuxoraf.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/86197118529.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/43683354676.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/woliwizopus.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/9280801711.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/how_to_calculate_the_mass_flow_rate_of_air.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/valkyrie_profile_silmeria_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 5468 bytes
SHA-256: c37f2089f7b23cac2e757b8d2775df7ee6f6026d098bedd82356759c625eb78e
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10440 bytes
SHA-256: 5c21b3cf6a03e71f639ced54d1a4600db37b3df9e56fc115a8b6f2edb799d230
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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