Malicious PDF — malware analysis report

Static analysis result for SHA-256 3832f767b33e1161…

MALICIOUS

PDF

83.8 KB Created: 2021-04-24 11:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45130454708fbf2c316509d2561474b5 SHA-1: 4aa1bfabc3863f493bb2ad0ede64f70bd21fba13 SHA-256: 3832f767b33e1161fcd8fd104c9649f3d7333ea8917c6160f04365ec748d90d4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one URL pointing to a suspicious domain ('nipisod.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=discuss+the+importance+of+technical+report+writing+ppt PDF link annotation
    • https://cdn.sqhk.co/poxofufiko/jjfifCk/wikijeje.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/eRUMNig/58611869205.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jTVjaja/light_house_cafe_niwaru_road.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/ajbDgcg/bomuva.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/ahhgcid/xonuvof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd26f5f7c959.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/hgSjiif/dog_run_pet_dog_simulator_download.pdfIn PDF document text
    • http://rometolipopi.iblogger.org/dj_golu_babu_bhakti_song.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/bca988265d243.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/egh4ibG/vomevukefuxuwasut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_60417aff52f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fe5291fd8358.pdfIn PDF document text
    • http://gobalesevusob.iblogger.org/xizumikuga.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/eiNigji/1523172752.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/ibeAjhb/total_synthesis_ii.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/oieKBei/elements_massage_clifton_park.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/27d6b37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_6034dd9e1149f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3607553a-54ca-4fc6-9963-a25749c53273/wings_of_fire_series_dragon_slayer.pdfIn PDF document text
    • http://gofokamerutasi.rf.gd/wasevogonazimunenin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f3e9fd-c555-46de-bdc9-ae5a056a8b73/44784859526.pdfIn PDF document text
    • http://wudowenasuvoror.rf.gd/criterios_de_normalidad_y_anormalidad_en_psicopatologa.pdfIn PDF document text
    • http://runugerobel.rf.gd/94029478754.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_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 5520 bytes
SHA-256: 6be97fe37f32dfc06d9d71b698ad45f8a378ab2856a8cef1392031f5ad1eb302
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10504 bytes
SHA-256: 14f0e840b2d4b865c5cc5259f8a6727d22ff9b8becdb71c8a0a42cd08607d456