Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdb08ac44691f1d…

MALICIOUS

PDF

78.2 KB Created: 2021-06-01 02:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8ecea63b126b6ef9974cff6338b93986 SHA-1: 63a7c6dc1c0888d913b01809229c4402e3ca2ec0 SHA-256: 1fdb08ac44691f1d8d30dba9f79c04b3fd7ea3306fd2f88c086cdaf5d4c7ddda
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded external links, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

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://cructi.ru/pbw?utm_term=cinderella+ate+my+daughter+chapter+2+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470391/normal_6004e3d3b89d7.pdfIn PDF document text
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/8368237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5fd368de7e2ab.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/26732409d532181.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/lolokafedekomafim.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/720cd31147.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/89dd994ac65b9f.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/xixux.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/fabipatapadem.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/3976934.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443588/normal_60afe2ca4d807.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/xerominonebawag.pdfIn PDF document text
    • https://walagewujiw.weebly.com/uploads/1/3/0/9/130968979/lokolez_zudujo_manabofonumux_durejos.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://zigunef.pbworks.com/f/tegufowisaxunafafu.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/mba_cet_2015_question_papers_with_answers.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/making_a_tuff_shed_into_a_home.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144431958/pro_football_game_tonight_on_tv.pdfIn PDF document text
    • http://sewafebi.pbworks.com/f/lspdfr_first_response.dll_has_crashed_0.4.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144416079/defobu.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144428484/how_to_check_my_internet_usage_t_mobile.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 5516 bytes
SHA-256: 5929b1f6e883580ab2919af142a8f77f7e5350c47f28766b45c7b125269a644b
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 10476 bytes
SHA-256: 59ba39327b43627f038a7844d059d84c8b9a6d3f3b1b70d42eb20c5462aa6d2e
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2