Malicious PDF — malware analysis report

Static analysis result for SHA-256 288748df49a26034…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 20:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f1f0bbce7172abc576906bb9ebc97f5 SHA-1: 7f449ed5a1d11cf6cd4f9f8013bba00a04f28b3e SHA-256: 288748df49a260341e9490c46ad71c97d470f0224f856ba6828480954c2fa7f2
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or distribute malware. The primary URL and the document's content indicate a lure related to downloading GTA 5, likely a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=how+to+download+gta+5+without+human+verification PDF link annotation
    • https://legukofa.weebly.com/uploads/1/3/5/3/135318177/0d876051b.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/ced54bd47f65cc.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/6482204.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/rosejorutukap_siwukuf_gabozekipoborub_dalimed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_6058dce017596.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474719/normal_60b5ca437228f.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/tisomafixir.pdfIn PDF document text
    • https://xasotuda.weebly.com/uploads/1/3/4/2/134235861/3185696.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/3072553.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/f724bf600d4ff2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5fcb4a4e1b567.pdfIn PDF document text
    • https://jatozaboko.weebly.com/uploads/1/3/4/5/134529560/vuwaworivek_pekukozo_xuwasugafilebo_lowobipululej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413265/75249121843.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/how_to_get_free_bees_in_bee_swarm_simulator_2020.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/15958986805.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/63382737998.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_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 5496 bytes
SHA-256: 1f31e6441e3ab5a49ae4d27fdea5f58959e4b1d382c27b6775562bc4173d4032
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 11168 bytes
SHA-256: e542f02717817a8b26f2a9080dde1bc63cee8383acb662cbc7d04ba6344b66fb

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