Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff88ba37c6652d98…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 12:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1202b45c0229574b6288af9dedab1da2 SHA-1: db34d4df8390224cc8e803e58541a04efd3ec60a SHA-256: ff88ba37c6652d98a9c09c1d813c99a4eac8904f8e9e4aca23696a0b9a7200c8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata related to PDF generation and potentially misleading text, further supporting a phishing or redirection scheme.

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://golowaki.ru/123?utm_term=past+tense+present+perfect+tense+exercises+pdf PDF link annotation
    • http://gasojowil.22web.org/64294468441.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/ehijaBe/sunbeam_ice_cream_frozen_yogurt_maker_manual.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/93519651142.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/eSiZihi/mini_trucker_2d_offroad_truck_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/hi9jcb7/birds_of_prey_harley_quinn_shorts.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/concrete_and_abstract_nouns_worksheet_4th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/pggNjjq/artillery_sidewinder_x1_cura_profile_4._6.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/vuraradaso/bajepigogowaxi.pdfIn PDF document text
    • http://nisegup.epizy.com/65871804192.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/oxford_phonics_world_1_phonics_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/installare_cestino_su_android.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_ae36a3e6d5de4ba287aa05dc9f5cc14c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/difference_between_central_nervous_system_and_peripheral_nervous_system_in_points.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_9c5a7f564a3c4854b1389542ebbfa702.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/14811622282.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/gadik.pdfIn PDF document text
    • http://widifusi.myartsonline.com/36187573199.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_ddd255636e9744a4a61c7dc218c438a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/rational_inequality_problems_with_answers.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d18894a40d57400ea30d2b4c574e0ab2.pdf?index=trueIn 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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 5188 bytes
SHA-256: 0a2610554e4f6329b00cac03b10558e8eeadb6ec377add7d1934f329a9a94f38
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10524 bytes
SHA-256: 2f7dd3fe34942a4beece0226bb26587a45573fc0d95a66105fab70f1165165cb

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