Malicious PDF — malware analysis report

Static analysis result for SHA-256 9424fac4d7d107eb…

MALICIOUS

PDF

78.1 KB Created: 2021-05-10 00:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 146d8a8061ddebcd020937cf98cb0532 SHA-1: aa384de6e45b02f48456a6675d84321243e9c14b SHA-256: 9424fac4d7d107eb2d40f8537436c5eda38409821876626c864699c151933f7e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various websites, many hosted on disposable domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=2017+first+aid+errata In PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/foriw-wiketosonakogum-sevili.pdfIn PDF document text
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/6745543.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/bifosotajifo.pdfIn PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/55471.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/gjggihi/fenasojibejumuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/eocgcgi/rainbow_unicorn_foods_desserts_cooking_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/gj5hcgc/alien_cars_3d_future_racing_game.pdfIn PDF document text
    • https://bajipupetezin.weebly.com/uploads/1/3/5/3/135315063/kukazifodaxutupijop.pdfIn PDF document text
    • https://nifanepuram.weebly.com/uploads/1/3/4/7/134700908/rotulofopo-letebuv-xolufesodax.pdfIn PDF document text
    • https://zufezoro.weebly.com/uploads/1/3/4/8/134885884/8636ad894cf9e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_6048ec233032a.pdfIn PDF document text
    • https://wavidamos.weebly.com/uploads/1/3/4/3/134316051/fazefirojarab_tokamaraxemut.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/gfWggJ4/the_sims_4_mobile_hack_download.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/bikigufobilixezudoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5ff96f80834ea.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/d9f0779d1f126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff17fc970d5e.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/4621c02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevowamudad.epizy.com/funuvagalofana.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_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5180 bytes
SHA-256: 0c90f06ed1a0b080f531762bf587deb0058413945ac9389c53722d769b0f9087
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11080 bytes
SHA-256: 21b5b5e0e5ae83c50cffe7ce2d90bfb605903f49d1fce9eab9a4cc3739ffe3b0

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