Malicious PDF — malware analysis report

Static analysis result for SHA-256 3397ae7efa2d87b4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-01 00:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1705abf46db4873473713cc3e159040a SHA-1: 2cff08a974b9fcf76ed1c4c5553125e3fe649367 SHA-256: 3397ae7efa2d87b484a6a5d0b283486cda0145cc6a8ac74ae08d16392ae803e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and the ML classifier strongly suggests maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it's a summary, likely a lure to direct users to malicious sites.

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://pelibifir.ru/123?utm_term=big+mama%2527s+funeral+summary PDF link annotation
    • http://natiral.space/dragon_ball_super_broly_telecharger5057y.pdfIn PDF document text
    • http://itverys.space/bilamolepisuzovixaxipafez9d9qs.pdfIn PDF document text
    • http://pokupka.space/71282435280t8k12.pdfIn PDF document text
    • http://republvinb.fun/word_ladder_worksheets_for_middle_schoolhu50e.pdfIn PDF document text
    • http://zupeset.22web.org/beethoven_piano_sonata_op_10_no_3_analysis.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/pilakasovejexepitimaligo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefuganut.epizy.com/24153142944.pdfIn PDF document text
    • http://xafopomafox.rf.gd/gakafamorinobisu.pdfIn PDF document text
    • http://sawutex.rf.gd/40810566136.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/jujew.pdfIn PDF document text
    • http://wewiligeva.epizy.com/snugride_30_lx_click_connect_base.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/93602556747.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/dovurew.pdfIn PDF document text
    • http://nivomijerunaz.epizy.com/bibliografia_normas_apa_sexta_edicion.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_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 5272 bytes
SHA-256: cbb2ec504cc6956cdf1f61556c9a94e91971359099e312387a76287b71bcfaa6
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 10776 bytes
SHA-256: 9d283d7e4bda4c5ac99269ce5e6fa88c4591173c025aaaa67ab1b64d310987d8

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