Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce41a597f986708…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 18:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a271bc260bf12bc70740bc744f1ea6d0 SHA-1: d834d1cf10e9eac56da5d4a0c96c8e844aea145d SHA-256: 8ce41a597f9867088ca8e5935c1d23576b7769ca618f95b0ff7c4da5755ebbdc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://maypoin.ru/award?keyword=cadena+de+suministro+pdf+libro PDF link annotation
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/kipunipumosinuwol.pdfIn PDF document text
    • http://siderevakeforu.22web.org/1197654292.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/bajulifugefetu.pdfIn PDF document text
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/nuwelupakis.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/feguzozaxujiza.pdfIn PDF document text
    • http://dasegirovitomen.22web.org/fusionner_deux.pdfIn PDF document text
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/bukafusepo-didogoduwonod-sudovi-damupa.pdfIn PDF document text
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/nuxiwuroranob.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/gonebiladofatanovan.pdfIn PDF document text
    • http://fitukogamoj.iblogger.org/broiler_pan_vs_cookie_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_601e093ef0fc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5ffa4219b290a.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/9556848.pdfIn PDF document text
    • http://fimobuzenetotij.iblogger.org/52779228055.pdfIn PDF document text
    • https://zapikomamotal.weebly.com/uploads/1/3/1/6/131606370/linov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_5fdfdc1c36c12.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/1054463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602be28953e28.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/gekewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffb7bd4a07ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://serekosesera.rf.gd/31378408106.pdfIn PDF document text
    • http://sanagubilisefuw.rf.gd/84723982146.pdfIn PDF document text
    • http://velumosak.epizy.com/horizontally_launched_projectile_answers.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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 5232 bytes
SHA-256: 7def9119d52e5b433e4015afce782ba97f9c3ccdbdcae84045a17e768f813734
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 11952 bytes
SHA-256: 82e45274f60179a14dccdaa0ea409dd6cab37b4109c374891ead1fb30832533d