Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc8f0487ebb85ac…

MALICIOUS

PDF

80.0 KB Created: 2021-02-26 20:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a027d44c76586044ee3e3c8efee35248 SHA-1: 5ad1d148f3ad2aead4dfa2ca6d9b9c7336ce1618 SHA-256: 4cc8f0487ebb85ac82f78af001df41bf8767c1d9adc3fcd44e1f7de82d3e9cb5
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or link farms, suggesting a malicious intent to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate this is a link farm designed to drive traffic. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to exploit users by directing them to potentially malicious or ad-heavy websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+clean+a+broan+hood+filter PDF link annotation
    • https://cdn.sqhk.co/debefuki/hTjd2gg/adult_coloring_books_michaels.pdfIn PDF document text
    • http://itsnat.space/clip_studio_paint_assets_not_ing6rwi6.pdfIn PDF document text
    • https://minibomutax.weebly.com/uploads/1/3/6/0/136011914/wanizoto.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/pekenefegatuxivo.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/ifoczgi/ice_hockey_world_championship_2019_slovakia_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/gieeGjc/neon_knitted_jumper_dress.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/68161979844ih9fe.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/fjjjahe/fire_ball_balance_3d_model.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/bibivunofet.pdfIn PDF document text
    • https://nogojajefe.weebly.com/uploads/1/3/5/3/135314992/tivazasitamumed.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/ANLgc7i/hero_hunters_pumpkin_locations_2020.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/amazon_kindle_reader_tabletine5h.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/eiifugh/52107708865.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ck6IhbP/galaga_adjustable_stool_arcade1up.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/DtvFibu/rezemakowiboze.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/dejolavubukugeb/labisaku.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/intermittent_self_catheterization_clinical_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/spreadsheet_meaning_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/92031229822.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/51512457391.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_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 5124 bytes
SHA-256: 5b28c82c3e95bdd908c894a3d00fec5e856138390fd4ded7ca093ef3d24fdd94
font_01_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 10916 bytes
SHA-256: 63004a80e7d11c7a51206b6a93d1c0f8bd24ac7d082ff021950304c8d0511040

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