Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fec1a35ef58f1cd…

MALICIOUS

PDF

109.3 KB Created: 2021-06-11 05:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: daa3408fa2e0f218b857b6c8883cf067 SHA-1: f4cac7c9ced82ad8075dcfbf638cd2ae9d111f2a SHA-256: 7fec1a35ef58f1cdc7111e757599af93425f580349c3216a51fd6aa7b20fb236
126 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 hosted on disposable domains, suggesting a link farm designed to attract traffic. The presence of a URL like 'https://pistant.ru/pbw?utm_term=the+weeknd+beauty+behind+the+madness+full+album+free+mp3+download' indicates a lure for users searching for specific content, likely to redirect them to malicious sites or downloads. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic strongly suggest an attempt to exploit SEO and user curiosity for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pistant.ru/pbw?utm_term=the+weeknd+beauty+behind+the+madness+full+album+free+mp3+download PDF link annotation
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/pibabupepivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_6050eab159e82.pdfIn PDF document text
    • https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/4775293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6010c5aef2dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fd3126aebdac.pdfIn PDF document text
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/jerogotumi-davitavid-nitaje-fovilusere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_60667a5852323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5fdbea620f8a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_6003d53b711b2.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/5940552.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/savedupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_60675f69d20a9.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/98dd40ad4.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/eabd311bdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisakupaxevu.pbworks.com/w/file/fetch/145100163/97460885560.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/my_coseva_trs_reviews.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144455898/vogue_cigarettes_canada_nicotine_content.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144651765/duxinavojeto.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/tagegujafetomek.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_off00014e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E27 8036 bytes
SHA-256: 5fba2c272ea1cad9d49a9de7777361502495ecdae70f122cf823bd78d146d858
font_01_sfnt_off0001695f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1695F 5792 bytes
SHA-256: c0b06696925f34866acb92c17f28bf38a5cfc25f9069433b02feb40ac003a1fd
font_02_sfnt_off00017cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFA 13428 bytes
SHA-256: ca59e3df1bb143a5ed42a8651582d14635eb95e44068781b142423edc54c5f9c