Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d50f262213e5a61…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 15:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 337a8aa97fea263ff277aa297a98537c SHA-1: 1d7eb62df6d0908b38871b02be3a31dee18c8e6e SHA-256: 8d50f262213e5a619530a9ed180ec2dada2bcb2ad028b7db783165ecf5b32779
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a large number of external links, a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://seumenha.ru/award?keyword=dibujarte+pdf+mega
    • https://cdn.sqhk.co/levowexesu/h8Ksife/super_mario_3d_world_review_zero_punctuation.pdf
    • http://zinefikitozozeg.sportsontheweb.net/kerebabebelokofigulule.pdf
    • https://verebabivudasa.weebly.com/uploads/1/3/4/7/134771522/gipun_wedovepepe_fakixawog_pesujetalene.pdf
    • http://nutosuvitiraj.scienceontheweb.net/sony_str-k750p_manual_espaol.pdf
    • http://memimusisat.getenjoyment.net/webosuteranajafomewini.pdf
    • https://cdn.sqhk.co/sidamebo/hu870MZ/bird_dogs_for_sale_near_me.pdf
    • https://cdn.sqhk.co/xurunesijud/gkPvRgi/beatles_blackbird_piano.pdf
    • http://xefawojuj.mygamesonline.org/98153770771.pdf
    • http://lukunezevowazol.sportsontheweb.net/4658353664.pdf
    • https://cdn.sqhk.co/lejukujegomi/atidgej/54634530220.pdf
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/9336057.pdf
    • https://cdn.sqhk.co/fikalibumi/R9bibew/agent_ransack_mac.pdf
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/kuwavenuvi.pdf
    • https://matixibufi.weebly.com/uploads/1/3/0/8/130873880/fdeb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_dd2d365d23d0430ebfd1325e61bc7c8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ba133a4-383c-479d-a73d-52bf14acb325/kewikamarut.pdf
    • https://uploads.strikinglycdn.com/files/426c81c0-d687-4b33-8fb0-7761ccdb6d87/felices_das_to_sergio_english_translation.pdf
    • https://uploads.strikinglycdn.com/files/c16546dd-7127-4d69-9a4f-919ff2acae75/bepufaxixiwava.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_8b7e3dbff9e9474b8486c9086eefb536.pdf?index=true
    • http://wumugajus.onlinewebshop.net/guia_de_alimentacion_para_diabeticos.pdf
    • https://uploads.strikinglycdn.com/files/b18a579e-93ae-4c2d-b31b-a7890e2f1be2/habits_of_mind_institute.pdf
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_214bafa44d5b4f379ce5b2b54a0e469c.pdf?index=true
    • http://jokosen.atwebpages.com/red_cards_in_joking_hazard.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_5237396714e84965baa6a42c4d08b091.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f320.bin
30fad9830549ff26611639f732eb49c10614ef7612954e9ac4a2acb17e00db6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5364 bytes
font_01_sfnt_off00010550.bin
59381b404c649a6df032d588f38dfc3ddbd4b6201557c29695502b430b5aed65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 12504 bytes

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