Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be63f14ef012282…

MALICIOUS

PDF

68.8 KB Created: 2020-12-15 04:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dc505427678173349fffdc9c1c5c1637 SHA-1: b285c8706b7d1dca0c4d69f89e810753a0b53f19 SHA-256: 4be63f14ef01228227de741eecebb1fdc786826dc3c1866071f12701ea2386c0
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains a significant number of external links, many hosted on disposable domains. This indicates a likely phishing or link farm attack pattern. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other mechanisms to facilitate redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=bsf+lesson+22+day+2 PDF link annotation
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/kuwagegidutun.pdfIn PDF document text
    • https://vevifogenumij.weebly.com/uploads/1/3/4/6/134626850/3062549.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/finajipot.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/5576367.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/watozimeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5fa012dce27b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fd1fe38c7c7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cf3b3689-5e7b-4e05-89ac-0608bf033149/nilot.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/webstorm_license_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ff6892-1ee4-462f-995e-d7ec3c122774/fotojitexesin.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/379237186.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/allelic_and_non_allelic_interaction.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 4748 bytes
SHA-256: b2012bd1a5f6f410c2b1099e1fdb5fb6ceeeafbc4c24523c57562163cc954fb2
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10444 bytes
SHA-256: c68fc9136f57cfdbb1ef9943d64dc32a8463fa3a4db52296b459e98653157a72
font_02_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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