Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ce7a918b7ae2c9…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 00:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6fba9f665c9bdf6dc0f596fc7e4fcdfd SHA-1: 8418e423571b6e002e72b910a2b80b9848f9922c SHA-256: 45ce7a918b7ae2c9c6d3bc9d3e3c9e508c74cc195e669acf8f3ae135b9b341f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/award?keyword=brilliant+answers+to+tough+interview+questions+susan+hodgson+pdf PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/jghidJ0/anonymous_chat_telegram_error.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/7ae27b5ba5189.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/eje8rhd/44800791950.pdfIn PDF document text
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/wutaxe.pdfIn PDF document text
    • https://lijokojojet.weebly.com/uploads/1/3/5/3/135333606/78c82511.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/naveruv_radofuminab.pdfIn PDF document text
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/6396449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413835/normal_5fc6aad75f989.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/widotowinipenowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fed725378821.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/jejin-zidaxipukin.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/hihcFKw/94601911592.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/dbVDche/73753896808.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/negev_sutuva_fenemidinobid.pdfIn PDF document text
    • http://farilanij.iblogger.org/gubulovexaje.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/a213e15c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_601f658018598.pdfIn PDF document text
    • http://lomipojiposo.iblogger.org/the_late_great_planet_earth_dvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_604ae09d9ce94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601718acc68b6.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/5e1540b4-a762-417b-80dc-a1293bc04d0c/how_to_print_all_documents_in_foxit_reader.pdfIn PDF document text
    • http://dizojid.rf.gd/kakuro_printable_with_answers.pdfIn PDF document text
    • http://xofafatererowu.rf.gd/double_bed_sheet_for_king_size_bed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56096cd2-5e97-441c-b285-309c4f731b9f/vufusirozagof.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5632 bytes
SHA-256: d968fa30cd99e2614dcf6f4ae22d2878ebeae077289ccfc1ff016ac2b919710d
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 11672 bytes
SHA-256: 4eff8b387c4a42a1c529ad6d96fb7e6623e6eba716986521f9ebacde6c4d0323