Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c58c5b7097f263…

MALICIOUS

PDF

74.7 KB Created: 2021-04-07 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e0541891541823084f6fac056ae2a2d3 SHA-1: 291146b4413831860d67189606794d7730910cc9 SHA-256: 88c58c5b7097f263e221b11e4efa76f0ed322dacad53472a08f1b3760fbad838
86 Risk Score

Malware Insights

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

The PDF is malformed and contains numerous external links, some of which lead to unknown or potentially malicious domains. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the malformed stream and link farm heuristic suggest an attempt to obfuscate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ponafet.ru/award?keyword=sociology+book+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423772/normal_5ff2f246f3455.pdfIn PDF document text
    • http://my-favshopd.online/9228663063kp9am.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/jaiiijK/one_piece_treasure_cruise_guide_jp.pdfIn PDF document text
    • http://zesamoa.online/catalogo_lusac_bombas_de_clutchmdq0p.pdfIn PDF document text
    • http://shoes-storie.club/fifa_world_cup_song_brazil_freeltfb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_602f9ffa7a1fe.pdfIn PDF document text
    • http://kuxuvajivor.iblogger.org/gusilelitivir.pdfIn PDF document text
    • http://stroiline74.ru/how_many_calories_in_subway_6_inch_veggie_pattyz9858.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/yijicgc/hexagon_board_game_name.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/jRihco6/vemovuperupiwufa.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/chfibs9/nail_designs_2020_coffin_short.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_60380eb863365.pdfIn PDF document text
    • http://qlemelest.online/786476597697g3py.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/dijIXgd/44160335469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_6037ca603a44c.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/dQhbhi2/4110780879.pdfIn PDF document text
    • http://wanuzib.22web.org/mhr_calculus_and_vectors_12_textbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fcce250c4ce0.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/fwiggcu/gorilla_city_wakanda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/dyson_ball_2_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/karewobarinezis.pdfIn PDF document text
    • http://bosotosevizava.rf.gd/68644079380.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/38936769776.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/fegovibufokinora.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/nibuf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5380 bytes
SHA-256: 0437ee7bb6b074f8f5f03c70800b57087c83a6502d1dfe02050051e6e9b6b878
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10832 bytes
SHA-256: 50dbc710f087226a281d0653f3b60b3af0ade976b800ce14b25a5fd528f561d1

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