Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31771fc9a3ce99…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 04:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c2abca1b493085fb97cb68fcf5335563 SHA-1: 6ce419fedebef5d689c6c8401abf8c79fcd95d8f SHA-256: ef31771fc9a3ce991bfd1399401afa44729ce93e09e0f0b2dc2bdcf0512dab19
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a pattern of redirecting users to potentially malicious or unwanted content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=weight+watchers+deals+jan+2020 PDF link annotation
    • http://lilubaxubaxulu.sportsontheweb.net/wendys_hamburger_nutrition_value.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/tobogegedomewojorebamunen.pdfIn PDF document text
    • https://mumabawof.weebly.com/uploads/1/3/4/6/134634692/nifozalafexegogozero.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/11748983750.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/Ohjj1jc/youtube_app_for_samsung_smart_tv_download.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/cWiaeRC/kuwewilibekezamaruz.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/TgjgjWw/selaruka.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/gjerghV/sogoradesinozojawugipez.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/cgfhcgg/chugod_vegetable_chopper_mandoline_slicer_dicer.pdfIn PDF document text
    • http://1-bog.ru/wumaruki3oun2.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/18351915226.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
    • http://gupizamowakop.myartsonline.com/57096424592.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/36942616185.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/free_business_plan_template_for_restaurant.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/defos.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/3534674029.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 5332 bytes
SHA-256: 6cc6ff81c051f9b2f5ea84fd90b22ff95d48113887a12beaccc77984dc7c6a42
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10672 bytes
SHA-256: 629c86b7fc752b6863bcc494cd19fe9cd1ae59657d04a42f592fe7153a31385c
font_02_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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