Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c1e39771e2e07e…

MALICIOUS

PDF

74.4 KB Created: 2021-02-08 22:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9663acbd473dfdc2b2244e009ead3fd5 SHA-1: 99d391d452a821d2f215cc051b63629aed6c9496 SHA-256: 71c1e39771e2e07eb2465d2193a7a74e21e6359ebe3a1f2990f34808698875bf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to disguise its malicious intent. The presence of external URIs and link farm characteristics strongly suggests the document's primary purpose is to redirect users to malicious sites.

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 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://maypoin.ru/aws?utm_term=viper+dota+2+guide+2018 PDF link annotation
    • http://moxolesapudeli.22web.org/twist_video_song_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/71dkThg/missing_you_brandy_tamia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcf83631a9a6.pdfIn PDF document text
    • http://bagajuz.iblogger.org/buroguxuwodimibelusidebi.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/zjbaidF/tokimeki_runners_starlight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_600bca93d63b7.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/djSbdJb/39987100587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_601b350f6f453.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/competitor_analysis_report_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/dovutiwabule/fjdgdft/craft_palace_pro_para_pc.pdfIn PDF document text
    • http://jisorozasakima.iblogger.org/84520414155.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/5sFJkgf/toy_story_smash_it_game_free_download.pdfIn PDF document text
    • http://gakarefutejet.iblogger.org/granny_smith_latest_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/5UBKlLi/vox_cinema_mall_of_emirates_parking.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/cthjjig/free_virus_scan_uninstall.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5fdd5d3fd1708.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jegjHhj/89716161943.pdfIn PDF document text
    • https://cdn.sqhk.co/jemowevu/YFhgzve/download_game_ocean_is_home_survival_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setuvufijub.epizy.com/specialist_crafts_safety_data_sheets.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_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 5400 bytes
SHA-256: 086bffead52397dc98530e2de63bdbf29124030d766df7353cc3564d394fc0e3
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10224 bytes
SHA-256: 945f674b3d6328131969d08533a424b2c27ed55d76cc234adaa19416e23e4fa1

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