Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f8634063e5cb7f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 20:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d92d79af0e859cc08cc9c9e1617ddcbe SHA-1: 196e87887dc757f71f000361b00e16da21cdf1e8 SHA-256: 35f8634063e5cb7f56064ed2c92bb7662b174ab98622c89f9af4cee7774df58f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or link-farm-like services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=notpron+answers+8 PDF link annotation
    • https://cdn.sqhk.co/kojanakif/fIja71E/tuzoselawu.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/dVhiAie/65731574497.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/sql_server_2020_features.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/Lie7Sif/glowcom-_lowest_calling_rate_international_call_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/heMjbia/beep_test_audio.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/what_can_you_eat_on_bright_line_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/iajeieb/gikopajigerukufilunobub.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/yUibYAY/pc_creator_pc_building_simulator_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/hjghYNK/80684030959.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/bihhxrv/surogowarofigirazewakesaj.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/physical_and_chemical_properties_of_amines.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/41607593090.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/getting_more_stuart_diamond_ebook_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/vgjiiJR/let_s_hit_up_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/Bhbmxjg/95592691234.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/nofurugipekepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/17950685249.pdfIn PDF document text
    • http://visunes.myartsonline.com/zopuzamafobononixumiforu.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/xoragasotefaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/badri_video_songs_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/jerusalem_artichoke_nutritional_information.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5036 bytes
SHA-256: fdff110729cda965593b1746ae461cf54a95dca251b149a18efc2dcf30ac2b42
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10868 bytes
SHA-256: 32360c012cb6d6161b868d03e4502037a309e9fadb22a5b834b620c2fa3f5223

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