Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f87094170b1865c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 00:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 47ed740b2aae5684df9568856f52cf95 SHA-1: 28bac2730972cf8774af29d77e9dd733ad7ab20a SHA-256: 9f87094170b1865c739eeb5324e2bdc9938bb83aa0b46694c93ffed18a727100
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://baarspo.ru/123?utm_term=death+street+fighter+2+mod+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5fe38fbb668e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_60449f3ee5ede.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/4462084.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/dphfIYG/vobabexurakolorabimuvovaj.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/7653890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216b8aa8a73.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/hlifhfM/hitman_holla_fight_barber_shop.pdfIn PDF document text
    • https://kisujaxu.weebly.com/uploads/1/3/0/7/130775962/87ec7b27.pdfIn PDF document text
    • https://babaxumo.weebly.com/uploads/1/3/4/3/134379683/xanitikuz.pdfIn PDF document text
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/zefopisekeleb.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/jfhhjdQ/small_business_plan_template_nz.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/dobikalif-kefizinadonet.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/iifhiie/la_vida_recia_letra_ariel_camacho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_6023ec6156d83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379842/normal_5ff54e008c517.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/whenWPs/50145258689.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/nagopo.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/9604818.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/3382042.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/9410873.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/5962632.pdfIn PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/2253176.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/77525078b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 5616 bytes
SHA-256: 134134a60283b44bc61887421f669a12ececcb5e0415bc337bd18ec52c2a226a
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 25408 bytes
SHA-256: e09702f5607915a272ddfb7842f75d4baebe223ec848f72038745871b27eade0