Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8db57f5121b84bc…

MALICIOUS

PDF

78.0 KB Created: 2021-03-03 04:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7a0a8c8d16af1a674f10a9bc4989110 SHA-1: 18e486eae56a096f92ce6bc1f2293dfd8fe81826 SHA-256: e8db57f5121b84bc9fcb6ca0e84d1d38412007636c18a230085203f27769897d
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external PDF files hosted on various domains, many of which are associated with link farms and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a redirector link further supports the malicious nature of this document.

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://dafemum.ru/123?utm_term=machine+learning+python+tutorial+free In PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/pogabemotoro.pdfIn PDF document text
    • https://mogiveruxapexi.weebly.com/uploads/1/3/0/7/130775775/41d735ae576.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/what_is_the_tone_of_song_asin.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/8490250e1c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_602ecc2ff15a8.pdfIn PDF document text
    • https://nutofagefisamav.weebly.com/uploads/1/3/5/9/135992035/bejobijo.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/sportcraft_turbo_air_hockey_table_parts.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/273a0b.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/d108250628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_602e387cb5ce2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvofaga.rf.gd/53855456693.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/crochet_hat_patterns_video.pdfIn PDF document text
    • http://daxizupalapa.rf.gd/garmin_vivofit_3_activity_tracker.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_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 5204 bytes
SHA-256: f7c7ae789fc11fde3d46e2056f517ec177754c09ff6bebf111605304fa9df809
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 10296 bytes
SHA-256: d2cd89fca832c63408554b7c779d6e9449359f29bdae18c218c80bc7bedaf2d1

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