Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ee3c99b5fdd293…

MALICIOUS

PDF

67.7 KB Created: 2021-03-22 03:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e80f50d482f0c6de2b47112851b8edb5 SHA-1: dd84c11203d72195587feae74884c82123086473 SHA-256: c8ee3c99b5fdd29340cbdb9a088c248c7c2c9682e72a2db45c36b1ae24f656c5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on disposable domains. The ML classifier also strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://xajibur.ru/award?keyword=arist%25C3%25B3fanes+livros+pdf PDF link annotation
    • https://cdn.sqhk.co/nukusigemug/a2hdfdq/easy_ways_to_make_fake_nails_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/0fXAig7/master_cat_pet_shop_in_delhi.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/ehhhDLm/cut_3d_blocks_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_600b65d195a85.pdfIn PDF document text
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/sobeweja.pdfIn PDF document text
    • http://konovulibugu.iblogger.org/wenigekavekiwegozu.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/6432632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_601a407a99cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_602e3647e7dae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notumaxesi.epizy.com/vfw_certificate_of_appreciation.pdfIn PDF document text
    • http://povorafolopoxap.epizy.com/math_symbols_in_latex.pdfIn PDF document text
    • http://refokosawo.epizy.com/nutrition_an_applied_approach_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/interior_design_jobs_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/jewamepovujanopa.pdfIn PDF document text
    • http://wofeduvep.rf.gd/xisikitapapon.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/ruvixi.pdfIn PDF document text
    • http://pawekixezad.epizy.com/audacity_online_free.pdfIn PDF document text
    • http://mosupixozijet.epizy.com/transformers_fanfic_arcee_x_jack.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/what_is_a_socio_economic_status_example.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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 5220 bytes
SHA-256: 0c9a9b8007aedd8cf2c3500afb294640c3266a0ef79c7e20c00d54c1cf886743
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 12444 bytes
SHA-256: 1f076a2c8bf8bca25d3e0465fd328a6db86a45e540dbadd71125f5af0df96c27

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