Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23518c4408ec0d3…

MALICIOUS

PDF

72.4 KB Created: 2021-03-19 06:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8fdf4832ea1a961843d6e7069e76fe3 SHA-1: 2a9757618eaf315f7154abc7d36750cc5a7431e1 SHA-256: d23518c4408ec0d368fefebae70ee67c1e4db9c1f64beb2e2a59239bffcc254a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential lure for free movies. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of many links on disposable hosting suggests a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=blended+full+movie+free+no
    • https://static.s123-cdn-static.com/uploads/4461767/normal_5fe1712792ed8.pdf
    • https://vovazukaliwo.weebly.com/uploads/1/3/5/9/135962855/4817873.pdf
    • https://cdn-cms.f-static.net/uploads/4464319/normal_6015841b53051.pdf
    • http://wubowobipevoto.mywebcommunity.org/smooth_santana_piano.pdf
    • https://cdn-cms.f-static.net/uploads/4484365/normal_6050e3ba77dca.pdf
    • https://mitanifujokuvu.weebly.com/uploads/1/3/0/9/130969645/ed672cf0.pdf
    • http://pawomodom.medianewsonline.com/bevitiwidipabetoxovepofuk.pdf
    • http://towufato.mywebcommunity.org/speaking_ielts_exam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://widifusi.myartsonline.com/business_letter_writing_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fe8b82b0-773d-4be5-ba9c-cc0333b0d65a/totoxikitanovimegewasolu.pdf
    • http://solezod.myartsonline.com/gujogebewefunedazegipepu.pdf
    • http://dowafirowelumex.atwebpages.com/40821930315.pdf
    • https://uploads.strikinglycdn.com/files/f84f5a24-4b17-44e1-9d37-c8f46d281bdb/how_to_use_the_face_key_links_awakening.pdf
    • https://s3.amazonaws.com/webipejonavuv/does_dumbledore_really_die_in_half_blood_prince.pdf
    • http://badamowafe.onlinewebshop.net/gadakajemuvazomenigog.pdf
    • http://pawuzax.onlinewebshop.net/terry_goodkind_warheart_free.pdf
    • http://rodedewezijore.atwebpages.com/3588660271.pdf
    • http://suvalomimo.atwebpages.com/alopecia_androgentica_masculina.pdf
    • https://uploads.strikinglycdn.com/files/2a4d0b7c-464e-4a20-b2ba-7cba7be884c2/92898072818.pdf
    • https://s3.amazonaws.com/jewizopukuni/neck_exercises_with_elastic_band.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_off0000dec2.bin
121000504f918b4e4aeb2219036856cab5053368e0cdd5af6ecbf0c553303a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 4776 bytes
font_01_sfnt_off0000eef4.bin
4f8da6132fb31160c77f0d3acd7e1b0382ffc489e1fd17414f142cb7874c6825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 10992 bytes

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