Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b913a5c9ad792b6…

MALICIOUS

PDF

84.8 KB Created: 2021-04-17 20:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34f4c2f3b4436e545c5d3e5c25bcf8dd SHA-1: e6d4e9a881457d4e22ab8ed45812536f9a509088 SHA-256: 9b913a5c9ad792b6013c4403f7f31ba226d264dce8287c812d3f5167d0f715c4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=can+am+outlander+400+rebuild+kit PDF link annotation
    • https://cdn.sqhk.co/wogirujut/iij5ib2/miribirudid.pdfIn PDF document text
    • http://in-arenas.com/great_book_of_tattoo_designsvqy53.pdfIn PDF document text
    • http://alifan.store/spongebob_sponge_on_the_run_netflix_release_date7lejn.pdfIn PDF document text
    • http://daliadiago.com/eureka_the_boss_smart_vac_filter3e2kk.pdfIn PDF document text
    • http://giveaway2020.info/blade_element_momentum_theory_matlab_codelrkbc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/5gdrQm8/jewels_star_3_game_free_download.pdfIn PDF document text
    • http://mavpa.fun/world_history_textbook_7th_grade_answersfy7mz.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/6lgihfY/masukefanedasawilofus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_32f79e7d00c645b2a5585406f9d4085d.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_ad9f4819ffa44e419780ea952793c94f.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_e4e22aa194e446b0ace795f7532a3610.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/the_ultimate_options_trading_strategy_guide_for_beginners_roji_abraham.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_5a506f8ff022475cab52b6d981dc79f3.pdf?index=trueIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_5596bb85323c443d8955b5399365eeca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/gary_vaynerchuk_net_worth_forbes.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/87816720964.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_dc301d12776f4133a13f29c77a4356cf.pdf?index=trueIn 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_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 5132 bytes
SHA-256: 02d06ba9dfc92e37ed81a7b92e32d15fbf50851cd671ccce603686dfc2314bb8
font_01_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11872 bytes
SHA-256: b630e163b3860307efe8baf5f6781b26f0dd099dd579b3e74e7bd79a0a68f3e4

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