Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c693f5b8f463439…

MALICIOUS

PDF

78.8 KB Created: 2021-04-21 08:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3885f2e142c7f822baab0425d487bcfc SHA-1: d3de7fe165f7c06ab3412c5043411049b298fbe3 SHA-256: 7c693f5b8f46343991c030c71a77ec0b5f391ccecb1a3282ae50868a9b9d6acc
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML classifier also returned a high score. While no scripts were extracted, the document's structure and the presence of numerous external URLs indicate an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/strik?utm_term=how+does+exercise+affect+blood+pressure+short+term PDF link annotation
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/8134144.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/9267797.pdfIn PDF document text
    • https://puvawimorewafiz.weebly.com/uploads/1/3/5/3/135383948/67747b61e0e.pdfIn PDF document text
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/5866905.pdfIn PDF document text
    • http://bovozewoxif.22web.org/nutrition_et_sant_cours.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/3272898.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/zuxime/josuteledolufivepapu.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/nice_guidelines_treatment_diabetic_ketoacidosis.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/burger_king_gutscheine_sterreich_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/where_can_i_buy_ethanol_free_gas_in_maine.pdfIn PDF document text
    • http://pomababotesu.rf.gd/wilitejokipumo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/android_10_ne_zaman_trkiyeye_gelecek.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/jesizinumezode.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/kerakebesiwimirezutor.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/69673601235.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/gilumumilusital.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/925226176.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/62988220.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/75447083986.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/28191013048.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_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 5656 bytes
SHA-256: f493c533cedb9b473c05b533c1a818c1b2fedf6cacae5c9310081b96986e6f09
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 11272 bytes
SHA-256: d6c0be30405c9b2e68a9ca003d6d748207895d733868365d8726fae4bf584f81

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