Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef700bbccb9959c3…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 16:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8a996e35940c9c14ca146f566b0bde34 SHA-1: 8054e9cbb7f2081e7b4637526bddb74c8ebce922 SHA-256: ef700bbccb9959c3df80aec5131c20f0bea98b59e39e23915d4fe01a83f7b465
126 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, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'trafficel.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a malicious purpose.

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 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=heart+transformations+worksheet+answer+key PDF link annotation
    • https://site-1168179.mozfiles.com/files/1168179/xojedimez.pdfIn PDF document text
    • https://site-1166067.mozfiles.com/files/1166067/32466035214.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/iifibJv/fewefokokowagem.pdfIn PDF document text
    • https://site-1177548.mozfiles.com/files/1177548/50144838867.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/lupadutapa_kosub.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/jdg0jhA/vowimulizegufazaw.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/viridiana_alvarez_chavez_wikipedia.pdfIn PDF document text
    • https://site-1176115.mozfiles.com/files/1176115/walmart_moneygram_hours_on_saturday.pdfIn PDF document text
    • https://site-1167993.mozfiles.com/files/1167993/growtopia_tools_free_download_ios.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/rotagogef.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/rakabexozu/best_android_games_website.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/zusigeletojix.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/functional_grammar_book.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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 5192 bytes
SHA-256: 562c56bb6cb5529320de1b5df9b6368968bfdff2cfdf46238710f33e61a1475b
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11040 bytes
SHA-256: 9c9680fb613cafe8df2772b03d5c35256a2bdd8ada7bc970137eeb25ca36d001

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