Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a85557d27b376b2…

MALICIOUS

PDF

77.8 KB Created: 2021-04-12 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b4c83eeabe3d50bdf2a6d062673def SHA-1: bd4737c6c4eeefaee5f1640413d3469544c1c008 SHA-256: 4a85557d27b376b277c026342b87645ce33dbeff3ea554924bf6a1a5c4b5df15
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one prominent URL leading to a suspected phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites under the guise of movie downloads. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=fifty+shades+of+grey+movie+download+480p+filmywap
    • http://about-central.com/75313527200lulb7.pdf
    • http://cosmosqrab.online/zebalafbcm.pdf
    • http://copalofa.site/putijanenapevalozipsq542.pdf
    • http://my-favshoph.online/current_india_news_livedxknl.pdf
    • https://kipopidetudi.weebly.com/uploads/1/3/1/4/131407440/80a90.pdf
    • http://blaugrana.ru/puxasexamovusuvommdzr9.pdf
    • http://podarokinsta.site/zugetawimonevuburuwanawiz3hx45.pdf
    • http://creditscoreusa.info/bogexoludizemepi15g8c.pdf
    • http://free-at.pro/47216393188scg0f.pdf
    • http://usesol.xyz/guximarexorumisiw1vo.pdf
    • http://avtoshkola-region26.ru/64534581770w8h0m.pdf
    • http://livethailand.fun/admiral_washer_atw4675yq1_troubleshootingguwr7.pdf
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/8420421.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://twitter-center.com/aaron_furniture_rental_storer6zo3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jujadodedaruxix/which_vampire_diaries_character_are_you_instagram.pdf
    • https://s3.amazonaws.com/pasawe/78534036318.pdf
    • https://uploads.strikinglycdn.com/files/3491d48a-5093-4c89-8b65-8b0ccb065573/star_trek_enterprise_episodes_with_shran.pdf
    • https://uploads.strikinglycdn.com/files/41772144-ea21-4c76-9a48-868891e285c9/61704171726.pdf
    • https://uploads.strikinglycdn.com/files/ddda87c6-c7be-4dc5-ac89-e6affaa17927/how_do_i_change_my_address_on_my_mn_drivers_license.pdf
    • https://s3.amazonaws.com/tutasujal/what_is_meant_by_husna.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10d.bin
e3350d0b796665c1367b3dc969b8545db1a29cf78fb34e17e45db1c7c4843588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5876 bytes
font_01_sfnt_off0000f508.bin
0c325fb5f98bde981bdadbea5ba3da2b3ded7ff5790a9c39635e0ffdbf4839cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 11364 bytes
font_02_sfnt_off00011bcb.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 4324 bytes

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