Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c624ee526d601c0…

MALICIOUS

PDF

72.3 KB Created: 2021-03-15 07:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1ef9f5b425424c0edbdcad96822427e SHA-1: 15ec46aa56efab2876f1adc864907e8fa2b098f8 SHA-256: 3c624ee526d601c0efdbcdc9a12a8327b8843f44054e2d5f7d8ba49b8411f203
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=subject+pronouns+worksheets+for+1st+grade PDF link annotation
    • https://cdn.sqhk.co/rodesedaded/iaEijhi/21943295931.pdfIn PDF document text
    • http://wavasesinile.22web.org/50262542680.pdfIn PDF document text
    • http://kolunikikirade.22web.org/medupasajekuzetedalunisun.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/0OjT7dr/64517768478.pdfIn PDF document text
    • http://nagaxutunasom.22web.org/commando_pc_game_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jjygjqx/the_environs_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/chejhhh/fables_the_wolf_among_us_comic.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://vaxikexuso.rf.gd/42451246295.pdfIn PDF document text
    • http://vepilezora.epizy.com/how_to_get_started_with_carpentry.pdfIn PDF document text
    • http://vakutasuv.epizy.com/1798620528.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/pezavonapot.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_fecaa2a3084342eb842aea589d86c607.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_fc96426211dd4b2a90d1d0bcf34cd828.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_7ba0cc3584a94c508f50a1957fba2a7a.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_7165862b92bc438aa22a698baadc8288.pdf?index=trueIn PDF document text
    • http://sirowozikuko.epizy.com/95050818786.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_e0585187c2cc436393ffec013aa04a1c.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_83389b14275c4ddb9923bd6db5f10344.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_5e0e9dbd0c2e4bdead008ce8f27f7068.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxiweke/best_free_fitness_apps_for_android.pdfIn PDF document text
    • http://felawikemuda.epizy.com/best_electronic_circuit_simulator_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/car_air_conditioner_thermostat_problems.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_bf6ecf1bbccb4802a1acab4c51623bf3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 5748 bytes
SHA-256: ba81c1cb3b65a90a79a6db6bb9057c95ad9f6886878c76cca5f13ca14f40ee26
font_01_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10288 bytes
SHA-256: 18088dbeef9cf5dc336629555ee4bb2a0e886c147f2e14ebaee56ef3cd44c0d3
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378