Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd33a0ce9aae3066…

MALICIOUS

PDF

75.4 KB Created: 2021-04-08 12:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0d000ea8f398aab233abdda5effcd1d SHA-1: effe228cd29e47a5504bf41aa8939ee4beee5e89 SHA-256: dd33a0ce9aae306658d63eefb63e273379dcdd576902f1cb62ce135546f71462
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL, https://xezojetit.ru/strik, is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://xezojetit.ru/strik?utm_term=comentario+biblico+de+matthew+henry+pdf PDF link annotation
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ijjijpd/68517033166.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/riduvegu.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/31b27.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/hegicLr/dragon_land_theme_song.pdfIn PDF document text
    • http://itchia.space/salary_of_information_technology_in_canadaa0ihb.pdfIn PDF document text
    • https://janazasifopuno.weebly.com/uploads/1/3/4/4/134437996/38bf831cc3b.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/5346354.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/computer_programming_languages_lista0q0p.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://bozagasixafovo.atwebpages.com/17861259395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbaae6a-02cb-43e6-ad41-dd596486b447/dd_3.5_npc_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ec11a2-c372-4fed-9824-f4ae2050137b/what_is_the_lesson_of_the_book_wonder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49951503-8161-40b8-96eb-b7611670eea6/46631513294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dbb589a-c14c-4272-96dd-aba9c333457d/genesis_9_verse_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/395c7329-c4ff-4fa5-8a46-f17f5f3e228a/sitobatuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc6c826-ef7b-48ca-b199-0009a976c83b/43554494229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8581add3-767a-4d89-ab8f-f455e0221c55/does_costco_have_a_hearing_center.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 5364 bytes
SHA-256: b107c081333f11f12a684a0a8bb5e160d55608fed235013324dc18cc8015efd9
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 11476 bytes
SHA-256: faed16475f9f03a316144eeaed48e86465fb4cf357e86cc940298412556a4427
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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