Malicious PDF — malware analysis report

Static analysis result for SHA-256 5310c898dd3f2292…

MALICIOUS

PDF

79.0 KB Created: 2021-02-18 15:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e1996a689a9aa3b1fc58f160d3b3d3f SHA-1: 9a7fb72cad7717abc4bde37d14a3b40f112cfd93 SHA-256: 5310c898dd3f22929386a5a6f2139e92d9d10acdbb2b4d4b8746ac336bafb64d
156 Risk Score

Malware Insights

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

The PDF file contains embedded links, including one pointing to 'bologen.ru', which is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'Presto electric pressure cooker instructions', aligning with phishing tactics. No scripts were extracted, but the presence of numerous external links, including a link farm heuristic, points towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=presto+electric+pressure+cooker+instructions PDF link annotation
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/xisimipajaxadawev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_602a329f753c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457854/normal_5fc75d00b403e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5ff8ef983f144.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/sepovutapakogaf/character_design_course.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/assassin_s_creed_brotherhood_gameloft_free.pdfIn PDF document text
    • http://jawedujap.rf.gd/13533675084.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/marketing_intermediaries_group_of_answer_choices.pdfIn PDF document text
    • http://suzufesa.epizy.com/hp_ink_tank_415_printer_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/buffalo_classic_low-_top_platform_sneaker.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/employment_card_registration_form_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/faxavageboriwujovufopipe.pdfIn PDF document text
    • http://pugavidugipiton.rf.gd/hallelujah_chorus_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/trust_associational_life_and_economic_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/vpn_gate_android.pdfIn PDF document text
    • http://duguzowosuli.epizy.com/facebook_for_windows_7_64_bit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 3488 bytes
SHA-256: 7499860bb0e16c2209ea973e8e6f09bb39ff18bc04cf75a4656dc1cf8db487f5
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 4784 bytes
SHA-256: b0d0c7ebd449c5704f8fbc2a9b4676f38bed3c8465d7adc5a4278da7066915da
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10676 bytes
SHA-256: e86bdf89993749f28bc9a3bb91ee34c371219b154b60b304f64fb6c8f1d32b05

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