Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc8c258deeadf0…

MALICIOUS

PDF

68.8 KB Created: 2021-02-15 05:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 017587e5992b974610728ded496b6d9a SHA-1: 4d4e073ad57e1939b80ce0ab23ceb7d3a7c5b4ce SHA-256: efdc8c258deeadf0fd04accc7b98028589ab2e87a23507d3cd2b86b39c77c720
66 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URLs, many of which point to suspicious or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a compromised resource, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/123?utm_term=recaro+performance+ride+manual PDF link annotation
    • http://digitaltoolsfor.xyz/jisenig26fuy.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/package_for_includegraphics_latexbw9lh.pdfIn PDF document text
    • http://help-copyrighteamservice.com/26393502148udwez.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/NGDsFjf/btd5_hacked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/itjiKoI/super_sniper_shooting_java_game_download.pdfIn PDF document text
    • https://juzubuju.weebly.com/uploads/1/3/4/7/134703155/66c5b77f31e9f1.pdfIn PDF document text
    • http://vipadminler.org/luruwigiwodut49.pdfIn PDF document text
    • https://ruponijipatom.weebly.com/uploads/1/3/3/9/133999380/kosiwepagijamez.pdfIn PDF document text
    • https://cdn.sqhk.co/dowufagit/bhijfFR/einstein_s_riddle_logic_puzzles.pdfIn PDF document text
    • http://xiluzoxasefeb.iblogger.org/carian_trail_guidebook.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/4fjckW5/32130370514.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/jujesiwuzadi.pdfIn PDF document text
    • https://jorobeperepi.weebly.com/uploads/1/3/1/8/131856290/7a355a5710.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/vajefam/cardiomegalia_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/latest_awards_and_honours_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/anari_hd_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/proxy_authentication_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/zudafebavabomuke.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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 5132 bytes
SHA-256: acab65ff9ce5c8aff5b14534c60410e850a652713ac709f05e8e2f393121af8b
font_01_sfnt_off0000e348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 10180 bytes
SHA-256: 44f3cda325b22e7c2ced47f0482ec50caf07e008210f28209730a6ce89d652d4

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