Malicious PDF — malware analysis report

Static analysis result for SHA-256 26076e7b81459dc6…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 14:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2862f6764623e3f268d5d44fd74ac884 SHA-1: 265ca7e580bf4590c807787f898deca88c0b0280 SHA-256: 26076e7b81459dc6eaaa048ddc3d83ac8dea5bca43742b2f8dcf24eaa58554ab
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is likely used to redirect the user to a phishing page or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

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
  • 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/strik?utm_term=why+are+there+so+few+male+social+workers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_6019ca1f5bcb8.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/5vjaehe/73546000366.pdfIn PDF document text
    • https://nozerazedigil.weebly.com/uploads/1/3/4/3/134309266/jarejedazonufelogil.pdfIn PDF document text
    • http://hempmap.ru/john_deere_lx172_owners_manuall6nqp.pdfIn PDF document text
    • http://zekagepalido.iblogger.org/como_leer_un_electrocardiograma_normal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_6004c0b5e68fc.pdfIn PDF document text
    • https://batusapetedovug.weebly.com/uploads/1/3/0/8/130873971/fadowibojuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/epwibjd/paintball_places_near_me.pdfIn PDF document text
    • https://kevewejisarugi.weebly.com/uploads/1/3/4/6/134611403/zopufiboloxu_veraz_zopunurid_vivabu.pdfIn PDF document text
    • http://mexicotop.xyz/94153045625op0nb.pdfIn PDF document text
    • http://azorocheat6.xyz/world_of_tanks_rngo5r8f.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/WrO7Zij/uninstall_sideloaded_apps_android_tv.pdfIn PDF document text
    • http://igme.site/17949699500zapf3.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://wefazor.epizy.com/strategic_planning_goals_and_objectives_template.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/android_emulator_for_pc_nox.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/reference_letter_template_word_doc.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5076 bytes
SHA-256: bfde61eeb65e3e6c1e08982132d9b18be0130f7c72b9a8651405ca0f15b872ca
font_01_sfnt_off00010afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 10956 bytes
SHA-256: b27f4c69d5605623df891b0d42a85bab576bf4b408244ead27c4fee7250c9db8
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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