Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f293f031fe7085…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 16:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 78a925ce830844fb642591833805ae44 SHA-1: bea1748a1f6e8aabfa7af5af6462e93251c4e5fa SHA-256: 39f293f031fe7085ab77454390556bc98b2004ed39419ecc9db14402bfb911ae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=lyrics+i+don%2527t+care+anymore PDF link annotation
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/nabosusejerume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_600c3a20bbcf4.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/dungeons_and_dragons_online_board_game_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5ffc392c83a94.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/LggheHU/maths_riddles_quiz_with_answers.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/b735336e93da.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/ifgj2ij/avr_pocket_programmer_pinout.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/ViaMhdG/boomerang_video_editor_online.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/tobasobesixi-rixiruro-setogonawekefuk-nuvimi.pdfIn PDF document text
    • https://cdn.sqhk.co/nepelusir/fja2ihI/cruise_ship_stock_market.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/tempered_steel_charles_young.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_a0f90400124c4ee88dc567c0d9dd2d84.pdf?index=trueIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_5af519a3e6a94055a7e3ac5af238e996.pdf?index=trueIn PDF document text
    • http://jezevenakos.myartsonline.com/oedipus_rex_movie_2008_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2a4ba6-8387-4653-8c88-a554800f71b4/vtech_phone_cs6919_battery.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_02fc0c5b338745489ce494c478fe7a3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d07914-dc64-4607-a53d-0359ba132cfb/ged_study_book_free_download_2018.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_1d95f29e574c419d9e1e334b2d33e36c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c958bee-e64b-4615-9d87-444f5a9b8006/56876317052.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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 5132 bytes
SHA-256: ea186283519811f9902a4da7a2786707be40b4a02669d8d1ace86ab2d85dac35
font_01_sfnt_off0000f0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 19904 bytes
SHA-256: 61d0fe58f41c4115d6674c0de2053f3ac85ba1e561e655f943be713ba1a52307