Malicious PDF — malware analysis report

Static analysis result for SHA-256 8357b4c50be310db…

MALICIOUS

PDF

83.8 KB Created: 2021-02-25 01:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 09fb19b878736dfdc753c5d0c530edb0 SHA-1: 57f49aaff721b66dd755501f4918c2875000542e SHA-256: 8357b4c50be310dbfdcf24fe6f415379a5f5bf3a70a1990a1414b1c4a0872e1e
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that lead to potentially malicious or unwanted content. The document's apparent purpose is to redirect users through a chain of sites, with the initial lure being a search result for "Ford 6.0 diesel parts for sale". The presence of a malicious redirector link and a large number of links hosted on disposable domains strongly suggests a phishing or scamming operation.

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=ford+6.0+diesel+parts+for+sale In PDF document text
    • http://vevaxogejaz.scienceontheweb.net/vector_mechanics_for_engineers_statics_dynamics_9th_edition_solution_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wefadegese/Ljekjfx/fernanfloo_2020_coronavirus.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/doxanag.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/luzovufuve.pdfIn PDF document text
    • http://zedukibawubige.22web.org/61293089743.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/9363196.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/mr_coffee_12_cup_programmable_coffee_maker_manual.pdfIn PDF document text
    • http://xivibogo.22web.org/why_is_my_top_load_washer_not_spinning.pdfIn PDF document text
    • https://nonewogigej.weebly.com/uploads/1/3/2/6/132681399/7947222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcb155234be8.pdfIn PDF document text
    • https://beredixe.weebly.com/uploads/1/3/4/7/134762790/sewirevipade.pdfIn PDF document text
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/babc57251.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/maus_ii_art_spiegelman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_6034c49904d2c.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/hagehiQ/tuxilovofob.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/5ed5812.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/taxufusores.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punozow.epizy.com/gst_product_tax_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 2940 bytes
SHA-256: b1a9ff6ba35dc6afe0897100fc92f3f1f3234f8fbf85b49142f1f5db2d57e62f
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 5320 bytes
SHA-256: 9cc7200a5f5ce5e394b9962c34c665f1b309f3557f90bacff68c879305188e58
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 10660 bytes
SHA-256: c3c4afa3002b294d3f358b4b58d8fd6f1083820806f52aba613ddfb386ce5d96