Malicious PDF — malware analysis report

Static analysis result for SHA-256 7828006da963013f…

MALICIOUS

PDF

81.8 KB Created: 2021-05-25 04:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 75f585a922261952fdf0644f744f914c SHA-1: d1c846155022939029c82b416d23c5e97f3b2a32 SHA-256: 7828006da963013f823a1c7bb7c26c68dd09b5dba40d91f7e6482995da5813aa
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 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 PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=dedupe+pros+and+cons PDF link annotation
    • https://jesaguxofugu.weebly.com/uploads/1/3/4/6/134659129/virofolimo-nuvetix-movesirawimufu.pdfIn PDF document text
    • https://kemizanina.weebly.com/uploads/1/3/0/7/130738765/8544917.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/tizizunori.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/kijuxazi.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/solidajuzobesaj.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/gutowowekifo.pdfIn PDF document text
    • https://votuxujalesobe.weebly.com/uploads/1/3/4/6/134683371/taxegidatirobe-jibisilori-pukuxatora.pdfIn PDF document text
    • https://sulagumafiwez.weebly.com/uploads/1/3/1/3/131383207/rixexonukob.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/9403611.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/lenumoxuxoxaz-posomojodene.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/gagakuditetarawe.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/ff31d7e0.pdfIn PDF document text
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/kowibolubaj_fujufi_bipuma_xidaxasu.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/d8d7f96d7f5de6c.pdfIn PDF document text
    • https://vosefeluvem.weebly.com/uploads/1/3/5/3/135382784/3638852.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/sikuva/nuxokutoger.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/sex_positions_book_indigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606501e6-cbeb-4c5a-babd-cd5f6afc0a59/panasonic_viera_plasma_screen_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/3600680598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a997eb9d-0108-4388-96bd-1852eab37a22/how_long_does_g_shock_solar_battery_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3240dd7-16d8-48ee-9d89-c0723142a187/tesasozoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351a8637-d837-432c-b7ec-35792124c1f8/what_is_the_subset_of_3_4.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/89052211545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addaf102-0561-49a8-ac12-39221602fd96/les_miserables_musical_score.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_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5036 bytes
SHA-256: 48d8e3921be0deb7af9c45d9cdb62be78989eae6aaa55b87a4b909b70105d60f
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 11280 bytes
SHA-256: 56a8f998f1015f9b343cbaf935fab09c473fae4f6e6e5f1940cb57c84d652875