Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec5492c2b30f043…

MALICIOUS

PDF

79.6 KB Created: 2021-02-28 16:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5e8a18bbe4c5c1468ca9d0038eb7a341 SHA-1: c4e69c05bc56f10cf8c459f66426e92d56d40c80 SHA-256: 0ec5492c2b30f043d56234943420a92479e346b2c2124c2f0e30f17a69b84337
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, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, references a product review, which is a common lure for such attacks.

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://maypoin.ru/strik?utm_term=cycleops+jet+fluid+pro+trainer+review PDF link annotation
    • http://jafujofefi.iblogger.org/forepefimibodotu.pdfIn PDF document text
    • http://nofovukad.iblogger.org/hcfr_user_guide.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77703230810.pdfIn PDF document text
    • http://qwonder.space/diseo_de_productos_turisticos_beatrypr73.pdfIn PDF document text
    • http://instup.xyz/how_often_do_breastfed_babies_poop_at_2_monthsa0ayt.pdfIn PDF document text
    • http://detonic-de.website/retim_durumlar_modeliwhayq.pdfIn PDF document text
    • http://mscredit.info/husqvarna_455_rancher_parts_diagramdjnop.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/18625099459.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/6919eaec2c2eb4.pdfIn PDF document text
    • http://segway-wheelchair.ru/bleach_vs_naruto_1._1._0_apkjo4n0.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://pimoxonevuwewax.atwebpages.com/connect_wd_my_cloud_directly_to_computer_ethernet.pdfIn PDF document text
    • http://vovajixavago.epizy.com/64957819027.pdfIn PDF document text
    • http://zizajaw.epizy.com/50946609112.pdfIn PDF document text
    • http://zotubune.myartsonline.com/metupuxinoguredanatobixez.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_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 5384 bytes
SHA-256: 5d4589d8297b77b7562ed9c8cf59d0b7389e3716e73b2c66d6c3e75f79f53adf
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 12000 bytes
SHA-256: 99d81af5ad7ba21ddbacf4198cc7dfa7a3170577bbc0b6f2ae9831e29ad0d102
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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