Malicious PDF — malware analysis report

Static analysis result for SHA-256 046a9b874aceef31…

MALICIOUS

PDF

77.3 KB Created: 2021-04-22 23:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5af14bf46fb5ce7cc307c453f3472617 SHA-1: 70f65dd080d8d6b6fd49a254bce69315ec8f0cd9 SHA-256: 046a9b874aceef31547c3c155c9ef7207230bc286162d4bc765b9ad8cef550e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm or SEO spam. One of the primary URLs, 'https://botokaw.ru/strik?utm_term=bissell+cleanview+complete+rewind+pet+vacuum', suggests a lure related to a product search. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=bissell+cleanview+complete+rewind+pet+vacuum
    • http://fukerijinexin.mygamesonline.org/filtration_water_treatment_process.pdf
    • https://cdn-cms.f-static.net/uploads/4451021/normal_5fda3fcc5c4f0.pdf
    • https://cdn-cms.f-static.net/uploads/4388427/normal_6068cc4fc575e.pdf
    • https://cdn.sqhk.co/xivovido/Khctegf/xivemeselolepowekuxepador.pdf
    • https://cdn.sqhk.co/wovedajuraki/jhvptRK/ee_voicemail_not_working_android.pdf
    • https://cdn.sqhk.co/lojibuwe/chd4OzT/35210229527.pdf
    • https://cdn.sqhk.co/rufebumu/giihheZ/91874313341.pdf
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fed2ca0922e1.pdf
    • http://vavazexowupex.medianewsonline.com/bc_rental_agreement_form.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_602e58c2b6b6f.pdf
    • https://cdn.sqhk.co/lazuxorus/dujiJjf/30991773381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fobupojowojon/kapaposez.pdf
    • https://s3.amazonaws.com/xeroguru/cricket_score_sheet_format.pdf
    • https://s3.amazonaws.com/luropiw/rakivexikinusu.pdf
    • https://s3.amazonaws.com/gitipelut/cysticercosis_treatment_guidelines.pdf
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_87fb1ec778ec4602a3cdcf3a19046f37.pdf?index=true
    • http://bitines.myartsonline.com/bromatologia_e_tecnologia_de_alimentos_livro.pdf
    • https://s3.amazonaws.com/wozoxub/44831756419.pdf
    • https://s3.amazonaws.com/toliwudalamem/mrs_spring_fragrance_themes.pdf
    • https://s3.amazonaws.com/webipejonavuv/webiwovaxuxudozefogu.pdf
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_3f7e5257516d406dbde20adb65a03787.pdf?index=true
    • https://s3.amazonaws.com/jivuxo/59590359322.pdf
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_0cad24141903401c9b67832a164c6bd5.pdf?index=true
    • http://kofepiropi.onlinewebshop.net/personality_disorders_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed2.bin
09fb55e1d8cc067a76a619eb03a3081291b426171b82672dd7e59109f22787fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 5420 bytes
font_01_sfnt_off00010140.bin
703600cc5a274970db2b552f008d0956a39696354169256b5d496c49f410f46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 11308 bytes

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