Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e2e13fb9d6b99c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 01:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d31b6a690c59e196b9afb7b67af6bdfd SHA-1: 7e7d8076a99eb891e2ec3d0428b939c1178527e0 SHA-256: c8e2e13fb9d6b99ccedbab6be5348aba339755aa94768b8b42891e8cde257ae1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

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://jottigo.ru/wb?keyword=baby%20bjorn%20high%20chair%20spare%20tray PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384039/normal_6024b500a5913.pdfIn PDF document text
    • http://organic100.fun/wild_frontier_game_pcuba7l.pdfIn PDF document text
    • http://vilopeg.xyz/nuxawajigubmokfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_60151e7c8da28.pdfIn PDF document text
    • https://vasidigugadojo.weebly.com/uploads/1/3/0/9/130969577/zatabo-vumolaxome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5ffcdb18c0fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_602179a699bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60108d4057913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5fdc57bcc55c4.pdfIn PDF document text
    • https://gubanezuwibudo.weebly.com/uploads/1/3/1/6/131606890/7155040.pdfIn PDF document text
    • http://winoraama.website/earn_to_die_2_unblocked_games_by_dylanruvdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_600b743ed1eb3.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/xukanomarexumu/14030880016.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 5532 bytes
SHA-256: 84ee741d942cb747494663af060553d3e389de23b39962127f271ffc54c0931f
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10672 bytes
SHA-256: 2e3eec99bd521e17062e21f3a5585f0530787b397f8d5bec09a19469919526f1

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