Malicious PDF — malware analysis report

Static analysis result for SHA-256 b490593af84909a7…

MALICIOUS

PDF

76.1 KB Created: 2021-02-13 00:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3a8c05aa67a3da480f95896cbcefe0ec SHA-1: 6eff82ff05aa485c8272b093eb558b0480ff7c9d SHA-256: b490593af84909a7e5dfe67d4323da689146f10606ea4446c774c849c55cce0c
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing or personal website services, indicative of a link farm or SEO abuse for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=backuptrans%20android%20iphone%20whatsapp%20transfer%20free%20version PDF link annotation
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/14c44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_6009949db55f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_600929cf7149c.pdfIn PDF document text
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/6314993.pdfIn PDF document text
    • https://neweruruxoponi.weebly.com/uploads/1/3/1/4/131453136/3105656.pdfIn PDF document text
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/bivasewulajije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5feb044e6b6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fee904661a73.pdfIn PDF document text
    • https://cdn.sqhk.co/mixasuwekov/Lhhgmhc/xajoridejusukofefokiruvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_6004809edf0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_600afc8cae04c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furugavasipif.epizy.com/99291717379.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/adaptive_radiation_in_reptiles.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/networks_guided_reading_activity_approaches_to_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/77689511804.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/mezalawesejaruxevufinobi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 5476 bytes
SHA-256: 9ece8416be399b45ffeddc6eb61ca0ce781f1b530c48d1082cb299bfe497fd01
font_01_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 11104 bytes
SHA-256: cb88528014f61743f3960aa1e20e0d2c64de277f1a3d87cf257eb5411442e9cf
font_02_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f

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