Malicious PDF — malware analysis report

Static analysis result for SHA-256 c973e8c9b0ded9eb…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 09:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d793d6d48f141cc580b196830ace57 SHA-1: d2090b46f023d302f5532745bd073bcee6df19c2 SHA-256: c973e8c9b0ded9ebd5dda7de14418279e4a30ae9ff3861c41306e4bd34adae3c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=aplicaci%25C3%25B3n+de+modelos+de+inventarios+determin%25C3%25ADsticos+ejemplos
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/9981153.pdf
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/13508.pdf
    • https://jubewujug.weebly.com/uploads/1/3/4/6/134653216/voziloxiv_sonirididodep_nulorur.pdf
    • https://cdn.sqhk.co/gizoxemovefi/hahgUjd/castle_wars_achievement_rs3.pdf
    • http://tijoxuxiga.iblogger.org/madden_19_franchise_mode_scouting_guide.pdf
    • http://mujuwowewo.22web.org/85451344892.pdf
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/6fd1e835c0984.pdf
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/4282015.pdf
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/lizomijux-litumimatozemow-gelalofemerumag.pdf
    • https://cdn.sqhk.co/dimowitop/de8Fnpi/real_police_bike_rider_highway_traffic_rider.pdf
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/8999b9bdef6a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lemaponodo.epizy.com/sacred_geometry_meaning_of_triangle.pdf
    • http://ralavokapijalig.rf.gd/nusuto.pdf
    • https://uploads.strikinglycdn.com/files/8d57f0f1-c203-4d65-8871-23d1a327bb3f/xomejuw.pdf
    • https://uploads.strikinglycdn.com/files/07213db1-c4d6-410a-956b-6e72335b016f/tijivugutuvenimonitufuk.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_off0000e691.bin
d71544e27c5d67e9c27b36b9293e3da86a2e1d41a00df5c2fa08d19873e92ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5536 bytes
font_01_sfnt_off0000f912.bin
9afc22ca3f1ae31edbeb1e57daa914fa98f3d1fda6e96ee890c0cf1dda525773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 12412 bytes

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