Malicious PDF — malware analysis report

Static analysis result for SHA-256 035dd45795df941f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-10 13:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5ca0ea106c5d8eb6b0ced0a52bb392a SHA-1: b1515fa45ac6546f8187c1fc4a22d86ee4394662 SHA-256: 035dd45795df941f6977de852933a317ae421997fee348681a6e2f61f9057b91
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing 'asphalt 8 free windows 10', suggesting a lure for free software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links on disposable hosting, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a phishing document or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://vilenefex.ru/123?utm_term=asphalt+8++free+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496404/normal_6013e189dd4fb.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/ibhhhhw/amazon_alexa_echo_show_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/jdz75CT/73711152922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5fe3c35c7cf57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_601fb8326f169.pdfIn PDF document text
    • http://mnclassis.org/digital_classroom_library_checkout_system3gs4g.pdfIn PDF document text
    • http://ampinternational.org/6769452083nhmwq.pdfIn PDF document text
    • http://allostar.buzz/zuvalegajupowufasrp40c.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/fihjhk6/kikunilejixafakoresexawem.pdfIn PDF document text
    • http://roman-holidays.shop/wufawobazijadixuvirumn9gr6.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/hbgfZ3w/nocrop_photo_editor_filters_effects_pic_collage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6036a0d0d3eac.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/pggiejb/mansion_hidden_object_games.pdfIn PDF document text
    • http://fuckfrsky.com/do_you_lose_muscle_after_40p9jnx.pdfIn PDF document text
    • http://cparta.moscow/design_a_railway_reservation_form_in_htmlz09ae.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/vuzotisenixava/redutoxijiponewofomoso.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/best_pride_and_prejudice_quotes_about_love.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_74b5ef800cab45f6a7595b5e923d0531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/grade_6_english_test_with_answers.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_b9bddc6bd2c840dda84117749d47b8f9.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_a0d9d6697ad64bb6ba101b100fc74e46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/adzan_subuh_merdu.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/how_much_do_top_lawyers_earn_in_singapore.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_86b1894363434034bbd7769668a6d63a.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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 5600 bytes
SHA-256: 3127e63dd8a1ac2df029039e8ea9abd13525c5c0859a16ade5c957522a403665
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 11348 bytes
SHA-256: e49b4431f21398ef3e670533edd9b5ee005d6e87729c41b85248a408f23008fc