Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81d9ee43803961…

MALICIOUS

PDF

75.2 KB Created: 2021-02-20 07:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ab330ad6c1913080b63b1742e1bb86e2 SHA-1: 2ec8c779374504e976bc7434dbbed8c0a2fdb52b SHA-256: 4d81d9ee43803961da4be75451056fe38810e8ab9e54e33116cf43805dc64d2c
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous embedded URLs. One notable URL, 'https://bologen.ru/123?utm_term=pirates+of+the+caribbean+piano+sheet+music+book', suggests a lure related to sheet music, while the PDF itself is identified as a link farm on disposable hosting. The presence of embedded links indicates an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=pirates+of+the+caribbean+piano+sheet+music+book PDF link annotation
    • https://cdn.sqhk.co/zetikitor/bjfhdJz/98454694042.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/rulonoganojak.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/ib6OghC/1027081739.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/hbSEeih/bawasodirifobudoxonur.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/gddWCjg/nes._emu_free_1._5._13_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ijhihbY/72721699173.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/iaEiihe/wotiwimi.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/kudowo/action_bar_android_studio_github.pdfIn PDF document text
    • http://dukudolit.rf.gd/52950199477.pdfIn PDF document text
    • http://lususexore.epizy.com/60428189971.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/6197385450.pdfIn PDF document text
    • http://tibupud.epizy.com/diremidozowe.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/ian_anderson_bouree_sheet_music.pdfIn PDF document text
    • http://nefaped.epizy.com/fish_anatomy_coloring_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/sql_server_2014_version_12._0.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/56327865831.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/shouting_bird_meme_template.pdfIn PDF document text
    • http://piduvazudofem.epizy.com/vijay_awards_2011_full_show.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5428 bytes
SHA-256: 2168bb21153f811dec3f383b3d8e959a7b7d79f49c15a114d6153d92b949393f
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 11120 bytes
SHA-256: 0073dae6f8a9c2266b9d5a10ed6cb4f1ae3f8774368149ab81da78eda0abffcd

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