Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aa40970fc321b0…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 73c55fa94b67170d66626cfb15b2eda0 SHA-1: 0a8d80dd444551a03b5a815afc86b928059c72d7 SHA-256: e8aa40970fc321b067738839b3a98a7d3a9d46ad7834226a3d9c5880271a0ab9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('zajinet.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=how+do+you+change+the+governor+on+a+tecumseh+engine PDF link annotation
    • https://cdn.sqhk.co/dutimapo/eFIhd15/pevapevimonojekal.pdfIn PDF document text
    • http://probmaka.tech/the_count_of_monte_cristo_2002_scripthmdef.pdfIn PDF document text
    • http://lorigofafam.iblogger.org/mobimesinopanitirif.pdfIn PDF document text
    • http://logoped-samara.ru/telemecanique_altivar_11_manual_espaolsb6o0.pdfIn PDF document text
    • http://studyweb.site/30746643109cvre3.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/fidiehf/tederirosiju.pdfIn PDF document text
    • http://dokaxirugik.medianewsonline.com/a_collection_of_algebraic_identities.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
    • https://uploads.strikinglycdn.com/files/8be3e04b-7453-44d2-ab7e-e5867b5806fd/hp_deskjet_2546_bulk_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35484a8-7ce0-42f5-b79b-616a62632b05/bitura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718498bb-f8ee-448b-864d-31e697dfcb9a/41866657083.pdfIn PDF document text
    • http://gafodix.myartsonline.com/86927704997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7857804a-e3ed-4948-9cb7-3fea2f988cab/lumejixepevevune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442890e3-563a-487c-9673-64abcbc54188/the_wind_in_the_willows_disney_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4069b8-87f7-4905-bc17-a1715959620d/fufaziwelorulonigijaka.pdfIn PDF document text
    • http://tuladupanekeziv.epizy.com/sri_anandamayi_ma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 5420 bytes
SHA-256: 92190980dc748daaf82369e41e8b8c8392e8fdff337c8c37747c7a94c2989408
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10480 bytes
SHA-256: c099d8a17c189f66a69d294a2f4611c00e898631f2acf676c53e2f4c6372c745
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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