Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7b65597207d686…

MALICIOUS

PDF

59.7 KB Created: 2020-12-16 13:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be8b5fea80d371a781e059492f49a297 SHA-1: 6c42e463c15fbcb759da08a4cbe3344caa03e768 SHA-256: 7c7b65597207d686b18bf4be8a3efac31118c56555e81873bde2234823dd1a79
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine rankings or redirect users to malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=silverhawks+toys+value
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/887640b2a2bcf3.pdf
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/5693633.pdf
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zidebesirolabavo.pdf
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/fativamen.pdf
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/66889d.pdf
    • https://winimotewo.weebly.com/uploads/1/3/4/5/134593518/tiwepozeraji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b9a32dc-bdec-45bd-b16c-b9e465237d37/buli_live_stream_kostenlos.pdf
    • https://static1.squarespace.com/static/5fc0c666116eb00e3c4b5099/t/5fc6367908845d09245e31b8/1606825594133/57041489491.pdf
    • https://uploads.strikinglycdn.com/files/3f662539-3496-4ec4-875a-3e984e6c8048/logowalitalizigowimebave.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3c31645712565406047b/1606302769786/star_wars_revan.pdf
    • https://uploads.strikinglycdn.com/files/cdb1adff-6b7d-4aaf-b094-88f9b5c2c3c9/41317708134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae1a.bin
73bce90be33f68df118b3079087f92be51632c58e50b91a341056ab8009ba3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 5192 bytes
font_01_sfnt_off0000bfd0.bin
30eb4610d21f355b8c3b311dd0d29a6414d7fb008237626b189f1bca19587c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 10000 bytes

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