Malicious PDF — malware analysis report

Static analysis result for SHA-256 601f3678d3ba3c69…

MALICIOUS

PDF

73.4 KB Created: 2021-02-21 07:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: adb3b2eac5e559e664c625d81b9727f8 SHA-1: fb8337cbebe8f673c442e15079c9e31fa381b162 SHA-256: 601f3678d3ba3c69f604c40386afb4d209ea1bcdfd41d88ad62d53e4a8356779
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to a large number of external PDF files hosted on various disposable domains. The primary lure appears to be a search result for exercise information, which then redirects to a network of potentially malicious links. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=what+exercises+work+the+gluteus+maximus PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/TL2MlXl/ninazopekunovebedorefiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fd1e4f865b75.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/0hdrW5Z/63108627669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_60115a76e75dc.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/1Aijkha/xiwepojivagejo.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/ponowusugale_sameti.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/7188085.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/jokudivu_papidov_bupidajelewira_vexut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_602542768cb62.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/c82febfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5fecd04066aaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff1cedd28105.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/ab079c1.pdfIn PDF document text
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/860883.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/6851683.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/wivabufopenigaxir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonapepubenej.epizy.com/report_injured_wildlife_brisbane.pdfIn PDF document text
    • http://wulimazef.epizy.com/20427464252.pdfIn PDF document text
    • http://vasiruduwoju.epizy.com/non_conformance_report_in_manufacturing.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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 5448 bytes
SHA-256: b2d4886882b473e40ad697f6cddb3e8539a49d00e119679f99861b57f69cab5b
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 9756 bytes
SHA-256: c411a43bd62e83cffb3a0efb2ca34f0f0fce7081f7f058481e64f0c15ebf5e13

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