Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c21e940f3b2a514…

MALICIOUS

PDF

80.3 KB Created: 2021-05-01 03:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6ea1f333a881951ff922b45cacde0e4 SHA-1: 01bbb3e4b5f1cd5084b9a09650ae0d0fa336c3b2 SHA-256: 8c21e940f3b2a5144dd376e662e421c1a1d2da913764a87e3d526f60789c412b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=bram+stoker%2527s+dracula+%25281992+film%2529 PDF link annotation
    • https://cdn.sqhk.co/wolowivem/ijen6jj/gravity_skydiving_bahrain.pdfIn PDF document text
    • http://khareedforosh.com/kaththi_film_tamilrockersqjm73.pdfIn PDF document text
    • http://klyshsheff.xyz/paper._io_2_unblocked_sitestr0g9.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/what_is_the_theme_or_message_of_the_story_of_orpheus.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/zavebirodowosaxexi.pdfIn PDF document text
    • http://repair-foto.ru/how_to_write_a_counter_narrativecu0k5.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/hbafgew/62852425014.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/17852898897.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/81608688941.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/iiMgiYf/pop_fruit_levels_angry_birds_pop.pdfIn PDF document text
    • https://zematuwarun.weebly.com/uploads/1/3/4/3/134327873/sojirodetoxaraf_wozogoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/jbjajcB/83534653794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sedowedi/bci_battery_group_size_chart.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_2b49b1d178e241c495908b1bbe1b141c.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_5cb1dedd68154eda8d6727964d57c621.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_2ec559809714453a9b30f654afadd358.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/17455150676.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/free_bitcoin_money_adder_activation_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/lady_bird_lake_trail_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/mimiwetojuxedogatituru.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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 5584 bytes
SHA-256: c421f51cfcd67174ea19a7f13df6582b20ef593d1915dddc9cd1b56120eb7952
font_01_sfnt_off0000ffc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 11024 bytes
SHA-256: 478cdd12a0ae92077bc2e37080f1288e97bdbda394c2ab86366bef4856eaa68c
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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