Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a866d34a80b625…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 13:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fcdc11f12efee6683bc171aea838176d SHA-1: 33c08e8a2dbc585ae736be9c0c72c44634ee37b6 SHA-256: 87a866d34a80b62570d3b98d761b9cdc0a6ef9a47305c5cc4265c91e27d547a9
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://leonvi.ru/strik?utm_term=programming+flowchart+symbols+pdf PDF link annotation
    • http://dashcamtopbest.com/modal_verbs_exercises_bachillerato_with_answers9oyaa.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/fojofezetebobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5ff27a3d2f647.pdfIn PDF document text
    • http://fullcreditreport.info/7364237483kn0zp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_6008a9a4e159f.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/WDWhfjc/gw2_super_adventure_box_world_1_zone_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_600d45cfd4ea9.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/dazuxujepov/40868688424.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/zapuwexubizubarafoxazu.pdfIn PDF document text
    • http://xefesogojodegu.epizy.com/36968625502.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/wawilij.pdfIn PDF document text
    • http://fupofew.epizy.com/descargar_alto_s_adventure_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/what_rivers_were_part_of_the_louisiana_purchase.pdfIn PDF document text
    • http://lofuwup.rf.gd/37380716631.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/grade_11_creditors_reconciliation_exercises_and_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 5904 bytes
SHA-256: 5eeca0303f723f523ed0f269c8b9df20af239d8b654ef54848bc8a071fe43a10
font_01_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 10032 bytes
SHA-256: f0540758731132512b4f293e6c63eae3d4fe5c4d053f9e213dc1befd31f2e1c7

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