Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f85bd958f0516…

MALICIOUS

PDF

107.3 KB Created: 2021-01-28 12:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28f87d9fe98f6b5f6552368dca293370 SHA-1: 9c9adc8ada028ef94b74987bcdf7ea829e614cba SHA-256: f40f85bd958f0516ddd21810dce206c08a14ec9d80dd0af24c4d4976cfe9043d
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains numerous embedded URLs pointing to disposable domains and potentially malicious content, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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/aws?utm_term=apprentice+act+1961+form+app+2 In PDF document text
    • http://lnstagramoriginal.com/barbie_girl_whatsapp_status_video_downloadptw6j.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/gdGgeih/9515010092.pdfIn PDF document text
    • http://kind-insta.site/istvan_meszaros_beyond_capitaluhvhn.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/deterirokadobotokipipunkg7qy.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/jusjghg/farkle_points_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fd071b8b513f.pdfIn PDF document text
    • http://vanlit.ru/ecology_and_societyatdjg.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/HgfIkdS/tiki_taka_movie_mp3_song.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/gcgdphe/vomuzitirewegolimowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fc9f7acbc446.pdfIn PDF document text
    • http://parralax.net/linovetimotitesesugegatb5f3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368246/normal_6008d27f172cd.pdfIn PDF document text
    • http://devlp.club/lunch_hero_weekmest9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5fd266436d1ce.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/this_means_war_full_movie_online_freewvgfl.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
    • https://s3.amazonaws.com/dibedamoka/bhaiya_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/addy_nagar_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/yumi_usb_guide.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_off00015cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC5 5224 bytes
SHA-256: 85af1b73fc04797c69903be5dd806939cbb1d9181710fff66e718af7bf097b91
font_01_sfnt_off00016e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E65 10232 bytes
SHA-256: 37eb7a70fa1b2e670e255f23b504b3542ba6ab1ea92cdb045a114af9826fecf3
font_02_sfnt_off00019149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19149 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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