Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbfd4dad2cbd7d9…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 00:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6777c57867e7508d5cb2fcd71e7908d8 SHA-1: 90ff3ae7e5912bed41df433986f2431a681459cc SHA-256: afbfd4dad2cbd7d98eef9ada90b667e23abf48b2a01190e0599aa48bb30644d7
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 0.9998

Heuristics 6

  • 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 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://botokaw.ru/123?utm_term=acute+exacerbation+of+copd+guidelines PDF link annotation
    • https://cdn.sqhk.co/gogojiranat/6hdWgid/ualberta_library_login.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/jgLhjii/best_buy_xbox_series_x_drop.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxamipuxum/hargggh/castle_defense_2_mod_apk_free_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/GrOigok/the_sims_freeplay_cheats_unlimited_money_no_verification.pdfIn PDF document text
    • http://bifovogixugot.22web.org/99661959963.pdfIn PDF document text
    • https://cdn.sqhk.co/woragumokewi/djdihif/49907204208.pdfIn PDF document text
    • https://cdn.sqhk.co/tesosunimew/jieOigD/kitten_playing_cards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5f18f3-5b2e-4778-830d-9472146220da.filesusr.com/ugd/6c313a_4afa5340840346a292d3737b0cbcc274.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_23fd229fddec418c850eeacb3e2850ac.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_99e861d08c1247daa0c4223b6ae8cb90.pdf?index=trueIn PDF document text
    • http://vakakumiwizexoj.epizy.com/tofev.pdfIn PDF document text
    • http://fapugiv.rf.gd/79720210645.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_17af7cedf4274d659c00b5cd36beca7f.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_777d6c43579146a4874403b7e642fb9d.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_713aab47136448d595062a76a311d74e.pdf?index=trueIn PDF document text
    • http://junorijuzijipu.rf.gd/autism_guide_dogs_canada.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_83a8d3da19444f9ab59ee8999dcab3f6.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_472c53bfa7fc41359d145b517ada0626.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_a5939eafd75d41c9ad24564c173d96db.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_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 5520 bytes
SHA-256: ecf13f99d57251556c32b07330d60254330efa2b8234dd90ee43e531b3a02684
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 11488 bytes
SHA-256: 0a25626e243bc9652616137635e15330d42468489ec7a76227cae4b5b285140d

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