Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c7d1ff2da58eea…

MALICIOUS

PDF

80.4 KB Created: 2021-06-10 19:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d18baf09892e69c13427fd1e2d4d0cb SHA-1: 525bdf44e2e776e63a138ba2a6502981d55208e9 SHA-256: b4c7d1ff2da58eea42e8e38c20a5e882d4862b00315c26e09fe44205a4357b1c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, including a suspicious one at https://laborke.ru/pbw?utm_term=dbs+broly+mugen, and is described as a link farm on disposable hosting. The presence of 'cmd.pdf' and related URLs suggests an attempt to execute commands or redirect to malicious content, likely via exploitation of a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://laborke.ru/pbw?utm_term=dbs+broly+mugen PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddcb7d4-617c-41e2-829f-7030370e931e/xenyx_802_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4ca6b3-c458-4ece-91f7-d3efb067e80f/27116441707.pdfIn PDF document text
    • http://kemuxin.pbworks.com/f/bupejebebegad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d4aa11-c82f-4932-8b70-2d249591568e/sonaxivavajigokeral.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/32484553063.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/wear_os_watch_face_apps.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/speakeasy_free_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b8c699-5e06-4a2e-a392-62bd885f635a/twilight_breaking_dawn_part_2_jacob_imprints_on_renesmee.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144426267/muginaderomififuse.pdfIn PDF document text
    • http://bijinim.pbworks.com/w/file/fetch/144494658/active_windows_10_2020_cmd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e92150-7afb-48de-aadc-759a669d7e5a/fobibenubabuvulivilopux.pdfIn PDF document text
    • http://gibabug.pbworks.com/w/file/fetch/144575910/top_10_nba_point_scorers_all_time.pdfIn macro / runtime command snippet
    • http://kenoxipej.pbworks.com/f/blackweb_power_bank_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49398a0-eac6-4663-81ca-c77c83d98fa1/10181701964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f799f55-19ac-4b02-9fe2-76b33c4ebfa4/xavasusojove.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/what_are_the_types_of_electronic_components.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea458a6b-94ad-480e-9bbf-d0d55f00f5e2/what_is_the_best_tension_for_a_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859a7287-101e-460e-85a1-a9ae0102f2d2/conversion_of_sentences_from_assertive_to_exclamatory.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/veminarepudefazusafuze.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144809262/.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
    • https://uploads.strikinglycdn.com/files/57e92150-7afIn macro / runtime command snippet
    • 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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5036 bytes
SHA-256: f4dab17fb6fd1dcfd350814672e355a4092e30d7465a8191a458a09fdf907bcc
font_01_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 12264 bytes
SHA-256: 10ed9b13cf95b6d8e6efbae534b01a6c09eff770d205477f07427031a3b3f94c
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 17284 bytes
SHA-256: 1b1764217d78571d0c2afe5b8b65f5e315b07c0ee4cec05118873ab13c494fce

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