Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ea6bd77cfb78b2…

MALICIOUS

PDF

100.7 KB Created: 2021-03-17 10:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5ffcf74b7bc104fe9cca46c8051f0e2 SHA-1: 22d4f6bad1059f012534b03af0653d3b71010d18 SHA-256: a8ea6bd77cfb78b28178e4a264a432ba856ba0f187c9617f301b1ea8b418e95d
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are presented as downloadable documents. Heuristics indicate this is a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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/wix?keyword=iperf+2.0+manual PDF link annotation
    • http://lixuwavujus.22web.org/how_relieve_back_pain_while_pregnant.pdfIn PDF document text
    • http://se-mrush.com/malcolm_gladwell_the_tipping_point_chaptersac5k2.pdfIn PDF document text
    • http://xakuneferufilew.iblogger.org/29271623293.pdfIn PDF document text
    • http://palitra-cveta.ru/damixawepipuwep4g.pdfIn PDF document text
    • http://nunokulivot.22web.org/hoover_max_extract_60_pressure_pro_breaking_bad.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/U8x4icT/led_controller_xbox_one_scuf.pdfIn PDF document text
    • http://nuveclovet.xyz/directv_genie_not_connecting_to_internetx4kbr.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/gif_live_wallpaper_androidvj5r0.pdfIn PDF document text
    • https://cdn.sqhk.co/mojubemuwek/gfvjdmJ/legendary_pokemon_cards_gx_and_ex.pdfIn PDF document text
    • http://hookup682.site/kapulodurar8qef1.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/fggpEPV/75515362015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://patuwovoparivi.rf.gd/59932687486.pdfIn PDF document text
    • http://xepadofesopi.epizy.com/jukifutixerigaxifetob.pdfIn PDF document text
    • http://metukobitoro.rf.gd/shackled_2012_full_movie.pdfIn PDF document text
    • http://gaxosinuda.rf.gd/zibugidejokofirovin.pdfIn PDF document text
    • http://wokakegefu.rf.gd/wine_for_dummies_book.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/zonevatexexofojekubefa.pdfIn PDF document text
    • http://saxigadulul.rf.gd/62188925173.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD8 4756 bytes
SHA-256: 8ea1cdee6829e60b57a882bbdab96ce7451b5a9f93de0e2149168acbcb9f9291
font_01_sfnt_off00014fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDC 11624 bytes
SHA-256: 7914df65244f441c381d933561a81189550a54e78cc7a16d67c76b6675231634
font_02_sfnt_off000177bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177BF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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