Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cba82ab7e50d3a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 10:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a8061a7e27bb20c297818b485adc791d SHA-1: 3fdfde1246e21a46721a4c7299e4b869ba783e7a SHA-256: 85cba82ab7e50d3a56cbcf90fb8cfb1474612d043c1ac5917fda60e3c8a89b23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=geography+club+brent+hartinger+pdf PDF link annotation
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/92c842603.pdfIn PDF document text
    • https://pavexoseg.weebly.com/uploads/1/3/5/3/135315086/rigadawomurofolor.pdfIn PDF document text
    • https://boxuxavuviw.weebly.com/uploads/1/3/4/7/134716171/327b0d6e55.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/fidanovitixo.pdfIn PDF document text
    • https://xuzelete.weebly.com/uploads/1/3/2/6/132681171/taderosan.pdfIn PDF document text
    • http://jumbochecker.com/surupixemezotuxeeru.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/ditak-xudirowa.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/pomeku.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/xozokaru.pdfIn PDF document text
    • http://strongcreditscore.info/kojunetoruvuworapofeb24w90.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/bupufokotetem.pdfIn PDF document text
    • https://kixorixoti.weebly.com/uploads/1/3/0/7/130740187/9d6eb0fa8aeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/concession_card_lost_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/voganixolalobepumatudumam.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/banulemofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2edb5dfa-0051-4cda-b7b6-f9ad246c0d45/15639117655.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/52610045080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688d6aa8-6f52-4707-9b46-951102e75ec2/19627575339.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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 5512 bytes
SHA-256: e9572f55cca32776d97ffbae0733af438a355401c8d81e07a929b920157e1f86
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10684 bytes
SHA-256: 35ab9924435b728a6cb39b0c831f5d1725732dfdb727355325c652f78e86292b

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