Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c74570e72ac50c…

MALICIOUS

PDF

77.7 KB Created: 2021-05-13 23:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f6eb259d64b82277310e067e93d44dc SHA-1: 831a1efcccd69a3695c04e876e089ee2c89458e1 SHA-256: a8c74570e72ac50cd036289a7ca8667d01b963453583cee347bd1185cb2eedd2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but one prominent link to 'ponafet.ru' is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=what+religion+believes+god+is+energy
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/6d8da4005a1b.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/tosex.pdf
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/wodozive_bomaso_kawizawuzoso_rubezivemebu.pdf
    • https://devegiwosoti.weebly.com/uploads/1/3/4/5/134592662/19475d571da.pdf
    • https://zemibojonu.weebly.com/uploads/1/3/5/3/135324970/3497559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinivukedeta/legebakosipatugafedo.pdf
    • https://s3.amazonaws.com/julaxel/tentacles_book_guided_reading_level.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_e23dd75382774991b4a2821fac82114d.pdf?index=true
    • https://s3.amazonaws.com/zalomi/after_effect_filehippo.pdf
    • https://s3.amazonaws.com/bulalowisu/mac_pro_1.1_user_manual.pdf
    • https://s3.amazonaws.com/feborobegibew/que_organos_afecta_la_anemia_falciforme.pdf
    • https://s3.amazonaws.com/fedure/kejopuma.pdf
    • https://s3.amazonaws.com/zunaporam/66764939404.pdf
    • https://466020af-28ca-49da-8edd-ce97b7315bd2.filesusr.com/ugd/8b97dd_46227c1c63ee4398adbaad90e0fedfe7.pdf?index=true
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_9c8c533912454f9992dcb71d6facd2e0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f738c8e-a346-4046-a308-c9dbbc98b525/can_i_notarize_for_a_family_member_in_texas.pdf
    • https://uploads.strikinglycdn.com/files/8c70aeb4-2b64-49ea-93a9-4434be9eed9f/how_to_clean_oreck_xl_collector_cell.pdf
    • https://uploads.strikinglycdn.com/files/9e394a8f-923a-480f-81f3-203c554d7ef9/star_trek_the_next_generation_season_2_episode_5_dailymotion.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_d795d5b05f304d44b3be1ee0b31cc5e8.pdf?index=true
    • https://s3.amazonaws.com/wopari/how_to_fix_jammed_bb_gun.pdf
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_43366bbdc97f46ff883816a03e01ccaa.pdf?index=true
    • https://s3.amazonaws.com/dudigonifu/kigiju.pdf
    • https://s3.amazonaws.com/tutasujal/augmented_reality_in_education.pdf
    • https://uploads.strikinglycdn.com/files/15fe1fda-fd94-4aab-b957-77de17eb4424/47215973682.pdf
    • 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_off0000f39c.bin
b9c7ea2569ce0c1e84d324ba9687342dc08f5dfe3a1aa7023a4965a860355d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 5404 bytes
font_01_sfnt_off00010602.bin
06522352722d7a067f90dab80349e23b557c9283dd56e192ba1889261de9b449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10388 bytes

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