Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ccf018526ac228…

MALICIOUS

PDF

78.0 KB Created: 2021-02-12 18:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73b29466988d6d11c1986aa5d45f8656 SHA-1: 2663af1336a73c94fb7bc53d94a1921f44557efa SHA-256: 74ccf018526ac22896ec5ea64153d46af22a2639920a9dc3d332d31c25aea946
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains numerous external URLs, many of which point to disposable hosting and are likely used to host or redirect to malicious payloads. The presence of 'utm_term=avg+secure+vpn+mod+apk' in one URL suggests a lure related to software downloads.

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://bologen.ru/123?utm_term=avg+secure+vpn+mod+apk PDF link annotation
    • http://sarhello.online/loud_dog_barking_ringtonehr6w9.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/90373855447.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/Yihhbif/98226817571.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/yAnMugj/xefonojivexijidojedek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff264a678f7e.pdfIn PDF document text
    • http://rubeatyshop.xyz/luxikw8s1w.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/TA7nPXK/ecac_hockey_playoffs_2020_results.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_60232bdff07d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/DGngiig/wosapubomof.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/gLNjh1H/parent_cue_preschool.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/chhtHY5/94402871463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_5fdba4093170b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotijoxamofos.epizy.com/haryana_govt_gazetted_holidays_2019.pdfIn PDF document text
    • http://mogerokefo.epizy.com/autocad_software_free_for_windows_10.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/venaseposikab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 5476 bytes
SHA-256: 3cbec839166af3bfc31e02d767c622cd1ec75b984440b6abda757a729964e6e4
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 12072 bytes
SHA-256: 77886eaa6a7a834096a854c0e0d24c8b817cefbd85892dfa049733f89145187a
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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