Malicious PDF — malware analysis report

Static analysis result for SHA-256 2620e608b079e615…

MALICIOUS

PDF

87.4 KB Created: 2021-04-26 07:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 354df10164fadbcf566463549aca4c14 SHA-1: dd72365930af778fbefa0138fb5359862c982b10 SHA-256: 2620e608b079e61589102e5c28a90a142e8cc53ef5213780e974f102a1f13301
186 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 redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to be a lure related to appliance repair, designed to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how+to+reset+the+ice+maker+on+a+samsung+fridge+freezer PDF link annotation
    • https://wewuketis.weebly.com/uploads/1/3/5/3/135327502/penipoderimepusevo.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/Lhieojg/space_wolves_venerable_dreadnought_no_longer_available.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/871858.pdfIn PDF document text
    • https://cdn.sqhk.co/sirigibi/OgdigKq/nfl_fantasy_football_sleepers_week_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zagekexeroze/hhj3QJU/bakipezedujubuvumube.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/TvW61if/are_candy_fruit_slices_gluten_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/kogcgiz/silver_the_hedgehog_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/74Ridig/casinha_da_masha_eo_urso_png.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/bCIiajd/coloring_pages_for_adults_printable_unicorn.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/1261742.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/fikanevaregisow_legipuli.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/jaiiggi/hair_salons_open_in_california_covid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_87ad6e7db5f44a228772bd5eb90722d3.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_75ce76d1149449f0a058e56e59cb6712.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8aae05f-a891-4756-a62a-375e9fdb3226/84464064812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52d428e7-637d-406b-9e56-e093182233d5/chicco_keyfit_car_seat_cover_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c56424a-1dad-4612-9302-01e9395247fe/how_to_say_navajo_clans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e959d4-0148-44b5-8489-5330540b7212/how_to_buy_inventory_for_a_retail_store.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_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 5572 bytes
SHA-256: 87305527cb851a0339f67b4701b0c047294d63e4b118be5373ad2bd17f1223b9
font_01_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 11272 bytes
SHA-256: 5fcf210398bff05ed29b1471839e273a03d7474d02df7f6287462dfde8969032