Malicious PDF — malware analysis report

Static analysis result for SHA-256 73401e8f7b57dd5a…

MALICIOUS

PDF

68.5 KB Created: 2021-02-16 05:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: e945448aab69c01101acfbf5946d0498 SHA-1: 6392ac80d13f38f895c9e72c52ca8fb70c968d0d SHA-256: 73401e8f7b57dd5ae1c2e57e42afbdf9ef55fffb21b332560660d8fe2ea7f0bf
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=liquid+intelligence+book+pdf In PDF document text
    • https://cdn.sqhk.co/sipobufiw/B5gd5jj/62875597896.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/f662ddcaa.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/jdieghV/75952607582.pdfIn PDF document text
    • http://loxokunetuladi.66ghz.com/73310056187.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/1682527.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/UiUhaij/recargar_celular_en_venezuela.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/hauz1gc/splendor_plus_i3s_online_booking.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/7807929.pdfIn PDF document text
    • http://polnews.xyz/87407361061dv7zo.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/aija0jh/tovufavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepedijuva.epizy.com/esc_guidelines_infective_endocarditis.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/template_ppt_tumblr_free.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_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 5108 bytes
SHA-256: dae481dbf62de30615c4ceebbed3e48a5c68123bdd1ea71d36da27fd687d87f3
font_01_sfnt_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 10240 bytes
SHA-256: 2df4994527559a8463ab4851c86bdcbc6620895aba8f49db60cc7bb6a47c2f2a