Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05fa7c06a2d1765…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 23:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c587389354a292bad24fcd47c4d29210 SHA-1: 7fed53725d5ba0065249d62c86b3fb7c27425526 SHA-256: e05fa7c06a2d17652ef8f83a6766249278369b4729963448fd0f3f6f78342bfe
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a domain that appears to be a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous disposable links suggests a tactic to obscure the final malicious destination. No scripts were extracted, but the document's structure and embedded URIs indicate a likely attempt to redirect the user to a site for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/award?keyword=pdf+to+word+converter+apk+offline PDF link annotation
    • https://cdn.sqhk.co/zinumazak/3gj35gr/intro_video_maker_apk_mod.pdfIn PDF document text
    • http://senteber.site/ralowizufexirevavapiq9lyk.pdfIn PDF document text
    • http://keruxiwu.22web.org/tinepiru.pdfIn PDF document text
    • http://goduvide.22web.org/meaning_of_dryer_sheet.pdfIn PDF document text
    • http://biomanua.website/lirofifejezapuxanuv86pxe.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Ojiiihh/menorrhagia_treatment_guidelines_uk.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/safejukas.pdfIn PDF document text
    • http://naturaitalia.space/reddy_heater_pro_110_repairu43yf.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/866ff3854fe72.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/mnhbWih/grandpa_s_great_escape_movie_netflix.pdfIn PDF document text
    • http://zifujujefilat.iblogger.org/lularoe_amber_size_guide.pdfIn PDF document text
    • http://wspring.space/4537477911056r3l.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/94d15e89-d395-4b84-b225-dc45013e9fd0/93798485571.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/maplestory_2_buy_music_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acd5ad8-47a5-44f2-8520-b76c02bf8843/animal_farm_quotes_napoleon_is_always_right.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/fellow_eternal_clash_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9363b453-96cf-4ecd-9e77-0f77aab60f76/sigisafabipiduzed.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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 5188 bytes
SHA-256: 1c5e6607bb9f48afaa28b613e7d666fe29b9172a739ea6307add47383149bdb4
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 11248 bytes
SHA-256: e7468d6cd2c9eaba56506b2e9858056c9e1b0f50fe00e7d68d6b02c5dfd65277

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