Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5ef5967e04447e…

MALICIOUS

PDF

77.0 KB Created: 2021-01-15 11:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d1c4be3e2e6375805f1c7b73530a23b3 SHA-1: 6afa051ac23aab0e8ddad9e8c6eb580f452bb02d SHA-256: 4c5ef5967e04447e08b326c6928e71cf10676b79639eae8ea43dd0cdf73b0658
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One prominent URL, 'https://cctraff.ru/wb?keyword=space%20engineers%20workshop%20ships%20not%20showing%20up', suggests a lure related to a specific search query. Heuristics indicate the PDF is a malicious redirector and a link farm, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm structure strongly suggest this document is designed to redirect users to malicious or phishing sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=space%20engineers%20workshop%20ships%20not%20showing%20up In PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/jozodusexomupi.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1407642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fc3fb445347a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fda481ed6fc8.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/4c935a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fee8a0f729de.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/yjg87ia/fitbit_versa_2_reviews_2020.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/movogumerivenolimetu.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/lilit-golotelekibax-gavol.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ihaiboP/pregnancy_week_by_week_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/hheQEzp/very_small_piggy_bank.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/3770085.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/r7zhiih/dufidipu.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/b6ghfgh/zombies_run_wikipedia.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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5420 bytes
SHA-256: a3e02ab023284321e57ab8e38ed2ca54da02b17f8a1155caacbfb5eaad53dc73
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 11036 bytes
SHA-256: 04e84321d7c122a20f08d886632af9525ca94d97db2ce0e56b2bafb967ce482f

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