Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c955bfbf4f8c9e9…

MALICIOUS

PDF

80.4 KB Created: 2021-03-20 19:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 905bc99dbb0965ef769a2d3c29aff510 SHA-1: 4eb31edb8e892e7408191ceaa5c0a05a826b76a9 SHA-256: 4c955bfbf4f8c9e9f0a124b90de4b56476fa9c2194b0cfc5c12f9a96ee1a4ddd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jacksth.ru/strik?utm_term=how+to+light+magic+chef+propane+oven PDF link annotation
    • http://baranaydin.org/fefuwejujijabijujazaripactvd1.pdfIn PDF document text
    • http://theporte.xyz/wifurufotodalatirijodevoos198.pdfIn PDF document text
    • http://thiswaytovogue.com/676473045541sduw.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/soxoxotuxoraknsew.pdfIn PDF document text
    • http://deemonatrafik.xyz/rabipajoletoderujukev7nz.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/ghIhhhh/rarest_pokemon_card_gx_tag_team.pdfIn PDF document text
    • http://4bochki.ru/harry_potter_e_camara_secreta_google_docs8irrt.pdfIn PDF document text
    • http://topmassage.net/gulukozodivi7i0xs.pdfIn PDF document text
    • http://sallely.xyz/is_hamlet_a_real_storylq13t.pdfIn PDF document text
    • http://businessmentality.com/mekilipovoxunobulvnm6.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/tp_link_tl-wa850re_resetfiq1a.pdfIn PDF document text
    • http://introdom.ru/bogixedisn0wfb.pdfIn PDF document text
    • http://timurberg.ru/wassce_chemistry_past_questions_and_answersha1oy.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/eWidif4/waluxuzuzosodadebu.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://faxiwig.epizy.com/1672394685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3c2841-b6f3-429b-b09c-0966a125b9f8/3597657534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720ae43e-798d-439a-a70d-8180e78752f5/42625273643.pdfIn PDF document text
    • http://neduweleviwov.rf.gd/zimorefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99c9924-c23d-45b3-a748-6983a151ec53/lujokiduvu.pdfIn PDF document text
    • http://jijulek.rf.gd/33872766735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10284323-4d47-496d-89fd-f99aaa94aaa2/faxonidokurisizil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 5152 bytes
SHA-256: 0b7a6c816c5455e9744597f455d13e5aa2cf015c5edf46606fb80b0ceca76a41
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10764 bytes
SHA-256: 3e6102bca777a2f5d5f640d3ed594aeb5376295f6783547553deb7d43b0d4f8e
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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