Malicious PDF — malware analysis report

Static analysis result for SHA-256 84017c933827a42b…

MALICIOUS

PDF

75.9 KB Created: 2021-02-14 04:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b3fe71463debe2a1815d83a3306347b SHA-1: a384a2efd95711d1b9efc18d79468e40fe767fb6 SHA-256: 84017c933827a42b1fe581a6841fc8d2371b76b7a9585d182ee317eefc0d9d0f
284 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and some redirect to known malicious infrastructure. The document's content is a lure for a free book download, but the primary function appears to be directing users to potentially harmful sites. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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/wix?keyword=modern+automotive+technology+9th+edition+pdf+free+download In PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/b8f2ae5.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/ferukojalowepoduli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_600a9ac911d22.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/8a57c97cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_5fd2f02575ab8.pdfIn PDF document text
    • http://crubr.space/63033742899gi7n.pdfIn PDF document text
    • http://omshop.space/55623379049swhhb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5ff6bd7b6e552.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/3879422.pdfIn PDF document text
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/e71209536f6a53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443344/normal_5fec7a2256b17.pdfIn PDF document text
    • http://clientesdkb.com/538599824643u9a2.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/9478167.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/5239099.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/tonisefoteka/xewumu.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/90599935553.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/63892269399.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_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 5808 bytes
SHA-256: 85c8b0f5cb5ebf2e3c632837953cbc6af67816c5b906dc08753be8d20c8aa324
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 10688 bytes
SHA-256: 0ac9792aada2ca169a725a5bfd6355c218c64674a7ed9a7af85776a511e89ab1

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