Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d8c729c988879…

MALICIOUS

PDF

77.0 KB Created: 2021-06-11 03:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 934f1fb6aa9064c5e78e6d2cab845fda SHA-1: 8b82275f698d41961112fe0d4adc7f326a275cc2 SHA-256: 7a8d8c729c988879292126035fa2d19039b9f3167a1a727841c421d688b7337e
186 Risk Score

Malware Insights

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

This PDF file contains a link farm designed to redirect users to various external PDF documents, many of which are hosted on disposable domains. The primary lure appears to be 'Zombie hill racing mod apk', suggesting a phishing or malware distribution attempt. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://medvor.ru/pbw?utm_term=zombie+hill+racing+mod+apk PDF link annotation
    • https://vopisozojozesa.weebly.com/uploads/1/3/1/4/131407388/2306656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477369/normal_5fdc2624cf2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_6047fe7f612ca.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/fuvek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_60214d3fc010c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_606a8e74192e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467945/normal_5fddd287820d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_602ee06048c1d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4453532/normal_60b387ae6c8b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ff3a2231cd71.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/guwuliverifulak_jumowixonuget_donurexifepobul_wegisisal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_6041fb722dd5a.pdfIn PDF document text
    • https://lovuvolix.weebly.com/uploads/1/3/4/8/134866108/1933921.pdfIn PDF document text
    • https://mitiguranam.weebly.com/uploads/1/3/4/4/134456526/dogomexukiwiw_bonigi_durineno_matawitafarulak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_606a73a6b6644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/233d76e3-66dc-414c-b133-b2a28b442246/download_es_file_explorer_for_android_4.4.2_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3031911-2760-4719-929c-51d8feeae740/5th_wave_movie_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccc6324-f082-4ee2-9361-05abe98a1e88/jisemapirutiminabejoxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9603ad0-e835-4ac8-a752-d7cf69ac5a0f/the_game_plan_disney_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f80361f-2e06-48f6-9d9f-05736f0c3038/70907907814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7402f04-f255-4690-aa21-f96a9cbc3a3f/donevogikizinokudis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 5468 bytes
SHA-256: 3cc7f85aea5d71504f9b7a9528ce3095f52ea7e9feb8b1505e3dbfdd7f1b7c12
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 11096 bytes
SHA-256: ce371a4cc5c75678ead86d8e9c4feaa6ffd99860fc85e587b85a4b4d0d883ee8
font_02_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf