Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ac3e906d07a1fb…

MALICIOUS

PDF

80.2 KB Created: 2021-04-29 23:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 45404fdc0b922a6a3ecfb39f68743ca0 SHA-1: 041d2fea85d329af1e4d4a4b1993ffbfa421584f SHA-256: 91ac3e906d07a1fb1d1ae91ee640ab8d91e0ba07214c0615c57ed8e28c57830b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=the+great+depression+was+a+period+of+high+unemployment+poverty+and+deflation PDF link annotation
    • http://felezebelitex.iblogger.org/writing_intervals_music_theory_worksheet_answers.pdfIn PDF document text
    • http://menformula.xyz/futavewebajfufq4.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/hgxxicu/basketball_shot_live_wallpaper_apk.pdfIn PDF document text
    • http://on-arenas.com/nikevifusanugiritovugaap56k.pdfIn PDF document text
    • https://cdn.sqhk.co/vaziworab/Fhbhjjc/math_worksheets_volume_of_a_cylinder.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/jdj5rgg/the_silent_age_2_download.pdfIn PDF document text
    • http://generatorsale.ru/236696571413p43r.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/Cjc5hjC/damanuxusanosaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/tumexifukevu/ghi2pHR/word_of_the_day_oxford_with_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_2c72b91c7f8c4bb99ca133e28c35135f.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_9c3b9a5cac654738b32dd742b7437342.pdf?index=trueIn PDF document text
    • http://zevuketeno.rf.gd/foam_core_sheets_michaels.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_1a3786012e674016a12409108792105e.pdf?index=trueIn PDF document text
    • http://mapimepokojanut.epizy.com/what_is_on_nachos_supreme_at_taco_bell.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_8d9f1b3e7b534dfe9f253bd04532b862.pdf?index=trueIn PDF document text
    • http://xopezolesuvobut.rf.gd/rikafexibimofovivij.pdfIn PDF document text
    • http://ponuruv.rf.gd/53665406523.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_1ec551eada57478185d97cf15989373d.pdf?index=trueIn PDF document text
    • http://nikavavufuxirel.epizy.com/edexcel_a_level_business_revision_guide.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_a3e9ef72f70b47049960f72c2cf3604d.pdf?index=trueIn PDF document text
    • http://xufutat.epizy.com/81508570552.pdfIn PDF document text
    • http://nufejubonuviwo.epizy.com/xudumekatozutimopu.pdfIn PDF document text
    • http://nonavijewiw.epizy.com/85098870534.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_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 5656 bytes
SHA-256: cae5b348f1c91e609dbc5b2c4a94d66fcb708d557c1e31e904616729b3f5c44a
font_01_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 10596 bytes
SHA-256: 88ea9b4592ab9e691352780c53aafff7157abecfdaa18d9dbb1b7f1750636026

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