Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ee5c01f5d6a800…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 09:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 19f62940815be092318b4e83e1d89014 SHA-1: 21ebadee530c5d4355e8ee2f18ac2e6d8da5ea18 SHA-256: 76ee5c01f5d6a8003ff1a76e9d620afbdec807ad9705cf5f857e33807726ad54
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to malicious sites. The document body, though heavily obfuscated, contains references to 'Keurig k cup mini sale' and 'consumer report', likely lures to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=keurig+k+cup+mini+sale PDF link annotation
    • https://cdn.sqhk.co/penutizufib/biagfj3/mulodavobaruji.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/ggUSCie/singing_classes_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_602045e84c063.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/tomuvima_pelida.pdfIn PDF document text
    • http://rifivejawix.22web.org/employment_application_form_free.pdfIn PDF document text
    • https://sakixuso.weebly.com/uploads/1/3/4/4/134488330/relufotoz_tujijezufo.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/5126156.pdfIn PDF document text
    • http://options.expert/detuxunurixotidimirojodnijn5.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/Lgejhig/radujoropulapiwolo.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/MjhSNgr/59413660352.pdfIn PDF document text
    • http://walletelectrum.buzz/85543771123nmc78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finubovuputok.epizy.com/investigative_consumer_report_requirements.pdfIn PDF document text
    • http://rorizupoduvu.epizy.com/78159198888.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/debupikom.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/kosegekagavu.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 5284 bytes
SHA-256: 40aebc5da59b199a8bc7eb18700f3d3f4dc56f06508ba70e2a937bf9b136703d
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 11752 bytes
SHA-256: 7b1915398eda2092becc633dff868f3a12fc38ceb28a53abf66c9d0137d6ccb8

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