Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c1dd729c06d00f…

MALICIOUS

PDF

91.6 KB Created: 2021-03-24 16:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 946bc31e80063a506b9eae0ada189a7f SHA-1: 4f2f5f5d5d88b1311a65d209217e2d8e3e6798d6 SHA-256: e0c1dd729c06d00fe11560c2756928f48feabfeb361156c3ced4dd50423ceeaf
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to downloading a book. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=garbh+sanskar+book+pdf+download+in+marathi In PDF document text
    • http://rasudilikid.mywebcommunity.org/the_magic_school_bus_chapter_books_set.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60331004cebd0.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/thajegh/turbo_racing_league_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/higshfB/download_game_tales_rush_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/iiFXgeA/zibux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_6034cfe3c33f2.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/yaseen_surah_in_english.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/can_depression_cause_you_to_hallucinate.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/fonoxawuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_603c2c9f8ebc7.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/bihVhb8/5632213345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafovinipola.epizy.com/is_drunken_fighting_real.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678643a4-338a-4cdc-9d62-0692c50f3f76/36220957313.pdfIn PDF document text
    • http://genolewedusu.myartsonline.com/bacillus_subtilis_taxonomy.pdfIn PDF document text
    • http://danuxobuzo.rf.gd/makalah_askeb_bblr.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_c388390a59d1492aba2a3be3366507d2.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_a60fa9a5c83f4d8ebf97308e7e18650a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4d260f-274c-4402-b583-7348620ee741/28771146588.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_8262b5bc19da41e9b8d05d15eec4daf9.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_5845a07e7fec4f1591bea111398a55ec.pdf?index=trueIn PDF document text
    • http://vulawogini.rf.gd/delonghi_coffee_machine_user_manual.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_fa9d4ad1dc144d39a30dcc46429d9bea.pdf?index=trueIn 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_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 5608 bytes
SHA-256: 7dcbd342bc003cc775725a47161404bfbb9730f48f65bb65d580113b1b5d6e4b
font_01_sfnt_off00013942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13942 11876 bytes
SHA-256: 5d05d098349f4b89583d35910a81fd871e034a1ea151366d92d9f7679d3a3f09