Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4d690e4d259ec8…

MALICIOUS

PDF

75.6 KB Created: 2021-05-12 18:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1cc6a63bea15bf9560214e4da3352dee SHA-1: d239b9caf152885e1d4427f00a71dcdf6d9666bb SHA-256: 5e4d690e4d259ec8791da52c28d2c4301117974febf019eb54766d8bbf84c7ff
126 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document's primary purpose is to redirect users to potentially malicious or deceptive external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+protect+from+tiger+attack PDF link annotation
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/wisud.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/dosawimutekotafiwi.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/livelepibedezabagogi.pdfIn PDF document text
    • http://sendgrid-de.com/foord_balanced_fund_fact_sheet_20181pleg.pdfIn PDF document text
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/fekexifowanaral.pdfIn PDF document text
    • http://nowtorrentz.com/wigexizopdnnfr.pdfIn PDF document text
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/870644.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/mawovur.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/7cd6b8c9.pdfIn PDF document text
    • http://899themes-demo.ru/xukafaxinavujojawizem0dqi2.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/9bbaacdd-faf0-4107-8d8e-ac4ecb72039e/how_to_paint_a_palm_tree_with_acrylics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855633f6-2b6d-496f-972b-847cdb8c7276/62134619762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f029fbc8-6499-4138-8b8a-783ba5c7bfbd/brother_xl2600i_tension_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6de9dc-0ac3-4c7a-974a-cf819d8c4e0c/49953383125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb3452e-593b-461f-bbb5-a385b938722b/14151934840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95764e04-95f0-458e-b54a-0d598525d2fa/advanced_business_english_vocabulary_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf497390-0b85-48db-820b-3f391d50c3c1/93918908595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24c9a08-cbec-40db-9814-8adf4982c5f5/cabelas_meat_grinder_mixer_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cae1760-00f4-4d96-b431-35eecf12cf93/kenmore_coldspot_ice_maker_not_filling_with_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ac903f-8c36-4059-bd72-5dd423a2a54b/19002327960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6938939-a135-4d33-a0d0-877411e23333/why_do_i_have_one_white_hair_on_my_arm.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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 5240 bytes
SHA-256: ef64573681d214fbdceb576bdba1bef8531493426fe0effd00da3032fec0f019
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10308 bytes
SHA-256: c87e9ceab313cafe6e0c970df2a7d79d2c40d255cf916139228d0435f18bb9b7