Malicious PDF — malware analysis report

Static analysis result for SHA-256 babfbdf8a5450fad…

MALICIOUS

PDF

74.3 KB Created: 2021-02-26 23:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ff85b3b6f768e12a00f9f38b541ad5b SHA-1: 7e97c8109902d1b54455c69d84142992753c6a5e SHA-256: babfbdf8a5450fadd53cdf7c40b285a8e4cf21e3dcf519fe705b1a5f6b1c4f4b
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link pointing to 'https://yafferge.ru/123?utm_term=the+green+inferno+2+2020'. The PDF also functions as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded malicious URL is the primary indicator of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=the+green+inferno+2+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fe6f353d54f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc716395ece2.pdfIn PDF document text
    • http://dowakofevumamol.22web.org/how_to_use_jandy_pool_heater.pdfIn PDF document text
    • http://beveram.66ghz.com/88376019408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_601e5fd54d525.pdfIn PDF document text
    • http://dazixetenulega.22web.org/78605834973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fe556b04bc22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fffb3ca79a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_602c2812c626d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_60301f9420f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482215/normal_6004f013b6ee2.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/pedutebujijozew.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/befafuni/dyson_cinetic_big_ball_animal_canister_vacuum_nickel_red_refurbished.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/half_life_2_achievements_guide_pc.pdfIn PDF document text
    • http://vimobuzu.epizy.com/bhojpuri_desh_bhakti_song_2019.pdfIn PDF document text
    • http://xumixoteralosax.epizy.com/business_analytics_data_analysis__decision_making_5th_edition.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/15449265055.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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 4832 bytes
SHA-256: 1bf23e21dc902272073bb1bfd613015d598cb8e28d56c14061448e3ee55daa5d
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10396 bytes
SHA-256: 95545979104b812804f3c387dcd4b942229750262a7b3079d82940d92b04d715

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