Malicious PDF — malware analysis report

Static analysis result for SHA-256 f878a7c72f1c4698…

MALICIOUS

PDF

67.4 KB Created: 2021-02-13 14:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 36c22dea1f519bc7daae50d81c4245e9 SHA-1: 9730b79fe5a2adedafc104b4f69e9c704e43a1a4 SHA-256: f878a7c72f1c4698ad43d2fda2729ebd8de7bb08a6141c9884e85486c9b809fe
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its function as a link farm designed to redirect users to potentially harmful websites. It contains numerous embedded URLs, many of which point to disposable hosting or known malicious redirectors, aiming to obscure the final destination. The heuristic firings indicate a critical risk associated with malicious redirector links and a link farm strategy, suggesting the document's primary purpose is to facilitate phishing or malware distribution.

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
  • 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 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.
  • 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/wix?keyword=snapchat+score+hack+no+survey In PDF document text
    • https://cdn.sqhk.co/wazikunal/jbih7gi/crazy_halloween_pumpkin_carvings.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/dbu7vhf/65159860964.pdfIn PDF document text
    • https://cdn.sqhk.co/bogijifaviba/ihjiThj/50848040461.pdfIn PDF document text
    • https://cdn.sqhk.co/wofamofupu/5VtBVha/bubble_shooter_ipad_free.pdfIn PDF document text
    • http://damvglaz0.xyz/read_alanna_the_first_adventure_onlifrg35.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/jatabipomafaz.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jesjcqa/helix_jump_cuts_logo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5fe40aa911580.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/iaKVibP/lumut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fcf11d8c5abb.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/pghhdih/pro_football_games_in_january_2020.pdfIn PDF document text
    • http://brandframeb.com/vikings_football_game_radio_stationqnn5q.pdfIn PDF document text
    • http://vigastlens.xyz/granny_square_blanket_edging_pattern89w0k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fe89dfb34b7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujunuge.rf.gd/bam_bam_bhole_song_dj_remix.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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 5316 bytes
SHA-256: 13062ed3966f025780a7e9a823e5ea64f567228ed2f6063604fb0ad68d89118e
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10160 bytes
SHA-256: deeea98168f94febe271f8395b586722aeadd493408d26359e3ec3061b85bc54

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