Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433466ff48d9b93…

MALICIOUS

PDF

78.8 KB Created: 2021-03-09 04:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6dd194d04ef6e7c0df813c10bcdeff2a SHA-1: eba6f0926b6b14b97283085e4b327171b8a1f7e7 SHA-256: 7433466ff48d9b93839b224c9e6ef3c450ae9c7826d6cb648a116b0abd7307b5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous external URLs, including a suspicious one on 'nipisod.ru', suggesting an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to a search query.

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=what+does+the+word+true+colors+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5ff0a673b4ea7.pdfIn PDF document text
    • http://vykupavto54.ru/hp_probook_4530s_original_chargerp8zqi.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/givuvudetowal-mikisekozusomo.pdfIn PDF document text
    • http://okstore.info/62838575454yxoyn.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/607f0a3188b264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_600eade12725a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409248/normal_6007d08fc6786.pdfIn PDF document text
    • http://alisaborodaenko.design/80624257196riopi.pdfIn PDF document text
    • http://8bitbeardsco.com/tunejaawi5v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxelula/4543400343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8b2e14-51ed-456e-a502-9b2d5a0135e2/25191724764.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8110072186e1461193cbfac13de80c5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/11665297361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a523524-506a-4a24-afd6-9774769147cd/jesazifodejamowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1112f01b-a531-44e9-967a-e58474832fd1/jukemesikarosifopudo.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_e08fd09b887a4cacac4fa84e6cd45332.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af379e55-d587-4436-87e2-ba3058986ec6/bawafovilefaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/96020213258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85da7a27-8f32-4a60-bd20-53e304fe17c2/36307629251.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/river_flows_in_you_piano_yiruma_original.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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 5284 bytes
SHA-256: 7d92cd9ae35cd7dd0a10ce39e50296bc4efb0293409d76320c24aad6b09fe55e
font_01_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 10404 bytes
SHA-256: 86a39e88ba943f0756fd62fd518c940f12cf3263b9c20f341ed70e5b95ddb87d

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