Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3a4571e8499023…

MALICIOUS

PDF

76.9 KB Created: 2021-03-28 06:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19199864fb94ff1335105114489a4389 SHA-1: dd821e80fa372bba734ad4224ca5830820671a37 SHA-256: bc3a4571e84990239ce167a586b854d8c8c2005f5e2ee27890426a77bfaa32fc
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting or link farms, indicating a potential phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware via these links. While no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

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://dugedepap.ru/award?keyword=ancient+greek+map+pdf PDF link annotation
    • https://cdn.sqhk.co/duponetix/cgfjd61/call_of_duty_warzone_download_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/AmnIjbB/swing_lowe_sweet_chariote_movie_part_2.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/pawijutogaxe_dumisifafadol.pdfIn PDF document text
    • http://raweloridewuwo.22web.org/lexulemulab.pdfIn PDF document text
    • http://dolobovofozuz.22web.org/what_is_the_last_book_in_the_whatever_after_series.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/iiY2tgc/smart_home_base_2._0_bedienungsanleitung.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/6536335.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/Yhhgehc/8623101214.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/cIZCyJG/man_down_wedding_band.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/ihcMkOR/dialogflow_webhook_documentation.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/6606124.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aHmsJje/foxeguvokipofi.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/tgdFo79/zabasawapebokivu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/jbLijjj/28653077201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikinevubebera.epizy.com/2004_lamborghini_gallardo_price_new.pdfIn PDF document text
    • http://bobupugarini.epizy.com/41708927377.pdfIn PDF document text
    • http://noxebujo.epizy.com/7677225046.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/vuzibukigotef.pdfIn PDF document text
    • http://roruxarese.rf.gd/timeline_infographic_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/telugu_mobile_movies_online_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/logitech_harmony_ultimate_home_touch_screen_remote.pdfIn PDF document text
    • http://sujemepis.epizy.com/essential_idioms_in_english_phrasal_verbs_and_collocations_download.pdfIn PDF document text
    • http://gozusufopam.epizy.com/aws_lambda_timeout_cloudformation.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_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 5316 bytes
SHA-256: eb67f2c17f2d5fc8b5e330f5fae308cb34c6f425837b6e5cfe455686edcb81c0
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10760 bytes
SHA-256: 53b0eac7d27546efb7e0f9f6ea409ae3ef1129d2446bddef247311c06f19463c