Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b0ada784bf4da7…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 04:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 78f190b998d266d7563e100f20151052 SHA-1: 58ad835cf84997c126a4e33d3856e5508af031e4 SHA-256: d3b0ada784bf4da7bb870834e59aaea0fcb88760795154a666a683ac981623fa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm, with a high concentration of disposable hosting and UTM parameters suggesting SEO manipulation or distribution of further malicious content. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The primary attack pattern involves redirecting users to a network of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=what+is+a+bus+network+gcse PDF link annotation
    • https://cdn.sqhk.co/kimejijomaki/jiugjmr/friends_tv_show_wallpaper_ipad.pdfIn PDF document text
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/4390717.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/gdhahha/stock_market_simulator_game.pdfIn PDF document text
    • http://i12tws.website/chrome_for_windows_xp_offline_installerp0wwo.pdfIn PDF document text
    • http://expo-kit.ru/agile_software_project_management_techniques4de76.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/sisolatev_vegizakoxef_lajome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5fe278efebec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fda8fde57249.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/bijininusumipom_gekavemo_kokari_leleponawomifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_600789ccbb387.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/b075f447.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/jbgijjk/neha_kakkar_punjabi_song_new_video.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/rhjhixM/who_all_died_in_the_100_season_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5febf02d6f388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sonisan.epizy.com/wotatufiguwide.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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 5220 bytes
SHA-256: 1ff9ac79fd744a1f23631e616edcd2872fd495bcf77c57cddb0b741c527110fc
font_01_sfnt_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 9988 bytes
SHA-256: 374eaa976c31db07b734aa0627adb3d66d4c655dc455a07d6dbc50fbdc660080
font_02_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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