Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3952a2ac1bdd50…

MALICIOUS

PDF

77.9 KB Created: 2021-04-16 19:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ed31c5565364a2c85bd0d53b7d4f614 SHA-1: 2185210aac72cc577bfce2e3881c6510f44549fd SHA-256: 0f3952a2ac1bdd50f6aa6e976728badc22a4e349edcabae1170669b480ed99d1
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains multiple external URIs, with one pointing to a suspicious domain that appears to be part of a link farm. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs the user to install a remote support tool, disguised as a free Bible application. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://lozipotod.ru/strik?utm_term=bible+for+laptop+free+download+niv PDF link annotation
    • http://tizezs.xyz/la_crosse_technology_clock_instructions9qxqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5ff5367cef6e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_606c896a43d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_603c545f82cc7.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/0jjjilc/17986961551.pdfIn PDF document text
    • http://antonioit.fun/modeling_random_processes_for_engineers_and_managers_solbergpi4ns.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/nowerewupovawik-guvakuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/lidesoxu/zhgyhif/99846739143.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/KYjc6hN/sort_and_filter_in_react_js.pdfIn PDF document text
    • https://xibijogoxedugo.weebly.com/uploads/1/3/4/6/134662411/fonudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_60621b5cb6bbb.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/sowila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_60378229a718d.pdfIn PDF document text
    • https://mozufakumijisa.weebly.com/uploads/1/3/5/3/135333945/9950449.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/c76ce0ccf1e4fc.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/idqjekn/sniper_shooter_3d_new_free_shooting_games_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fd6add96225a.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/hfij3ic/filter_sort_song_ringtone_download.pdfIn PDF document text
    • http://fsfsfd.xyz/idsa_c_diff_guidelines_2017hu31u.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/paropabaru/teamviewer_9_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/industrial_revolution_dbq_essay_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/66193649726.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_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 5196 bytes
SHA-256: 19edab82436b7f6ebd4793c869f4aa1918e0aec8f94913948eb926ee883a839c
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10724 bytes
SHA-256: 4199a552fb29ef4cb59a8b90de44e9dac864a02c3f3fff45eacda1d177bee91a

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