Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2e3d3f92983842…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 04:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 546b34448dae46d929fedede59bf1e79 SHA-1: 17673868cb0270b376cd6a6e39ec94a5ba34581a SHA-256: ca2e3d3f9298384227c33205051884fef408853066818aa6bd8b0a11399d3955
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9960

Heuristics 5

  • 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://zajinet.ru/strik?utm_term=data+analysis+using+software+packages+microsoft+excel+and+spss PDF link annotation
    • http://superheatbelt.xyz/19237540552g6n8q.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/cgdEsgd/cnc_lathe_machine_parts_name.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/T6ojjjc/49859082158.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jj4hdbh/53333643514.pdfIn PDF document text
    • http://alteramaks.world/zapisetuwopagv7uxi.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/KvGjg1J/dikulosigafega.pdfIn PDF document text
    • http://hhizmet.com/410224258423xaz1.pdfIn PDF document text
    • http://itawegan.space/nuxopirenuxe4xuk1.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/5099425.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/gchbrjh/wopawu.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/OigBpih/67294070014.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/je5ibib/nikagimukuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/id6pcJ6/stories_your_choices_is_matter_memes.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/ruviwa_mopuwezodoz_taxeporadimil_wanowamolemilux.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/Wifjaif/blank_invoice_templates_word.pdfIn PDF document text
    • http://aycotoro6.xyz/80812003698n943s.pdfIn PDF document text
    • http://begdas.fun/importancia_de_contabilidad_de_costos_segun_autores9f5zi.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/Digkih7/49225443847.pdfIn PDF document text
    • http://albl.ru/retejitifsrz8w.pdfIn PDF document text
    • https://sokamokijajupi.weebly.com/uploads/1/3/5/3/135348419/fd75e02.pdfIn PDF document text
    • http://bioforcecolumbia.site/mercury_black_max_yearsihlqv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/550d2f0c-9ddf-479b-a713-5c5ce89873ec/samsung_un28h4500af_wall_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fb374a-779d-4860-999e-496ed0f2d55d/97625136980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce9fc00-7df0-4294-b2cd-c618e1ae351e/we_can_remember_it_for_you_wholesale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ddf25c-f8a2-4b42-8b6c-298799482aa2/wepofinezojilono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87ae2bc-777a-41f3-8b39-ec9b3adbb739/john_truby_anatomy_of_story_review.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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5800 bytes
SHA-256: 9162bdb4076e2b036e21ecbc51248e31711d5d7c7e452b969b846c11e10ac593
font_01_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 11716 bytes
SHA-256: 76e0d5eede3f6f88318acbf0ea730b8cb84737315099e53e462554515dd17785