Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b147f93b8724858…

MALICIOUS

PDF

82.9 KB Created: 2021-03-15 21:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c669cad4494cc4ef6700d66ba5afe6b SHA-1: bd14faf307afe7c4826ff7812ae9635709855c3a SHA-256: 9b147f93b8724858b52261d0b16f93aea6ee43bd69c408f9ff6ab4b5b23bd774
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=delirium+trilogy+book+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fe7373808e1d.pdfIn PDF document text
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/4774678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_603f7680ccf8f.pdfIn PDF document text
    • https://jirixakevafu.weebly.com/uploads/1/3/4/4/134404576/4581461.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/zulosowikulupifip.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/sonezonuligi_posozatagusef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_604e768fcaddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_603ad6572d90f.pdfIn PDF document text
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/gedomaxozebubek_nofebefik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_6000c45234e4c.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/f8b658d2ee70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_601468ced9670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_604950ea0ce49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_602fb55384237.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/9423233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_6007a6fd544c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5a6faa23-442e-47fa-afbf-e7e3eb69fdaa/the_quran_bible_and_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec34215-f8f2-4e71-81e9-fe711fe6b150/quotes_from_the_selection_series_with_page_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d959793-eb3c-4c01-a6fb-3d0322c9d0fb/42682246549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e0de63-efde-49fd-a504-69f24551b9c4/6820151243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6143f469-ec33-460a-8626-d357f6f26f70/movosekitulupoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11a2ee2-e9f9-4fac-9eae-851ad24c3bca/1890235456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078970ee-e3da-45b8-a0f0-1912ab66a9d0/which_dried_fruit_has_the_most_calories.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_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 4788 bytes
SHA-256: 77bf3978fc3cfc70c9be1333d304ef27d4da4cf8c21b472cafde382f888968c5
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 10516 bytes
SHA-256: 22c873614fd7529a210e8b445c3ec428a76688f14d41677abb0f0f4ef07f8a57
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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