Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c86c03f4a8c723c…

MALICIOUS

PDF

58.4 KB Created: 2020-12-19 21:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c35e5f5389e64186140496d1145d9fdb SHA-1: 9458a551440c9bc1fa2c68008a83ba3a81f84ebb SHA-256: 3c86c03f4a8c723c17b508c6207dcfd1d064a62c6a98fe02c179360fa2bbf107
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The document's content, disguised as a worksheet key, is a common lure for users to click on embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=phases+eclipses+and+tides+worksheet+key PDF link annotation
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/9977749.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/giruwitepibuxopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d735d0a0-1197-4b1d-88c0-62ce551427a2/kivemipufil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842db3fb-023b-4986-a3e2-b9f660fb46a8/gevibusamojexilukujuboj.pdfIn PDF document text
    • https://s3.amazonaws.com/ruletetunima/american_born_chinese_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6341aeda-2499-4f4d-8203-a6118978678c/roundup_vs_250_steamer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a200cb-861c-4a84-897c-ca04601f3f78/lidisuverepojabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab68af6a-bac3-47be-bf48-8b831e0428cf/detamuzosejisudelutezuk.pdfIn PDF document text
    • https://s3.amazonaws.com/muguroviv/kuxebak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20fd1925-6681-4046-8ef2-8cb6d881cfba/appliance_parts_seattle_aurora.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/david_sherrill_georgia_tech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a844ff4b-7031-4fc1-bc04-cefc51034687/xinoxewixajavemenovumo.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_off0000acce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCE 5420 bytes
SHA-256: a9c2835821f2b4db658dd2a816ace5f09dc8a67424c0fb4358b5bd8687166703
font_01_sfnt_off0000bf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF47 8612 bytes
SHA-256: 42da12f7809015fac0ba5a8af1f072d146e072147222b279b52c27cfd9704fc0

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