Malicious PDF — malware analysis report

Static analysis result for SHA-256 937751b8697831dc…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 19:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd5c10c737d726eebdfd129a8ab0ad8d SHA-1: f766cce2fd5530ee4de80066c1fa0bd444c1d307 SHA-256: 937751b8697831dc33a54b1b42e6007ff7f18e32ad8dff5876ea0beb4ba85eb5
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The presence of numerous disposable domains and UTM parameters suggests a phishing campaign aiming to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://ponafet.ru/strik?utm_term=hcg+diet+plan+phase+1+2+and+3 PDF link annotation
    • http://dhl-order.info/kidemejivenidufk4do7.pdfIn PDF document text
    • http://vertigoa.online/kezokujobotukilufijoxijor556z3.pdfIn PDF document text
    • http://aarbuz.space/new_bhojpuri_full_hd_video_2019tmaqc.pdfIn PDF document text
    • http://amsidgi.xyz/gps_garmin_255wt4bu1x.pdfIn PDF document text
    • http://amsidisi.xyz/sharp_12_digit_printing_calculator_how_to_useqrdh3.pdfIn PDF document text
    • http://forkidsshop.online/wolf_of_wall_street_canadian_netflixm8vsk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601ec1901c273.pdfIn PDF document text
    • http://italia-doc.fun/wotinipawirexufijuwifsp5b.pdfIn PDF document text
    • http://hookup754.fun/sekuforikebajupilrlvp.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/3880101.pdfIn PDF document text
    • http://serviceforyou.site/five_dialogues_apology_summarytyjte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufutogaj.epizy.com/ti_86_calculator_rom_download.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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 5548 bytes
SHA-256: dde3f194aafb724ef2af21449c58ac6585a63976a1c0261580c775dd41536ab5
font_01_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10240 bytes
SHA-256: 5cf96e12fff66044d271979634b3c68fe8f85d1c34edfac251f23cb47e0f7d18

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