Malicious PDF — malware analysis report

Static analysis result for SHA-256 191ec07e293b6c00…

MALICIOUS

PDF

77.3 KB Created: 2021-05-15 20:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f63bc483cc8e16c020be59b8e483eb0d SHA-1: 909046e94f314ec56e87b62a208176bcb3f7aea2 SHA-256: 191ec07e293b6c003ac04271369543a4ac3008f49b11c1b809ddf529f699ca80
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=what+emotion+is+the+color+purple PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420448/normal_6028f0f4c76cd.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/3720250.pdfIn PDF document text
    • http://card2card.live/xemirabuft3ek.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/jiax1jg/rigorevetabavuruded.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/GPgejgn/bopalaje.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/gigZgcB/proskit_tone_generator_3pk-_nt023n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fdbacec96ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fefc91557a3c.pdfIn PDF document text
    • https://guwubujurod.weebly.com/uploads/1/3/1/4/131438509/4171972.pdfIn PDF document text
    • http://naturfresh.fun/start_where_you_are_rashawn_copelandb1vi2.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/fVjjhgi/tech_news_today_tom_merritt.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/dLgfhiF/the_roommate_agreement.pdfIn PDF document text
    • http://imkl-checker.com/getimezafulevajugasopavoir1f6.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/gM7Mdih/tamil_to_english_learning_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/fjacjcv/programming_languages_list_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/jcZieEq/zamupegezus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_60088091afabc.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/Rjejegd/pancake_milkshake_game_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/9geV5t7/new_guitar_mp3_ringtone_download_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/jijipidub/ji7jdzm/55705718838.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/Augj1ge/tennis_ball_gun_diy.pdfIn PDF document text
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/b362543a9e55424.pdfIn PDF document text
    • http://inglassrus.ru/can_i_use_any_developer_with_igora_royal5bql8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 5188 bytes
SHA-256: 2315e46bedb7498aab47cc31b59c0ef46d57b354d0ec269247d7b8955194259e
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10788 bytes
SHA-256: e5841f2677564abc216002cf1c4f24f5b660156cfbfc4bd08d99411fee09a4c4