Malicious PDF — malware analysis report

Static analysis result for SHA-256 f881b45f95e6ec10…

MALICIOUS

PDF

80.2 KB Created: 2021-03-31 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb5a087e613de840cb0ff78f4b297ea8 SHA-1: cd83e02d73990d8dab5f833d665e6a21adade808 SHA-256: f881b45f95e6ec10849dedc018b2eb471a1867bc74b42ac15cbd994d33500bea
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The 'Local anesthesia in dentistry pdf' title in the document body, combined with the external URLs, suggests a lure to drive traffic to potentially malicious or scam-related websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=local+anesthesia+in+dentistry+pdf PDF link annotation
    • https://cdn.sqhk.co/bikegola/hgcAnhe/popular_skins_for_roblox.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/49678766814.pdfIn PDF document text
    • https://cdn.sqhk.co/zabadiripo/fQIhihh/bovedugoluf.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/5BPgfhd/epic_games_launcher_fortnite_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/debefuki/jaIjjig/nuteginagamupazenop.pdfIn PDF document text
    • https://cdn.sqhk.co/turomixo/i9ygioG/26010300315.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/GhdgeDK/16730975698.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/jhCxgdT/dinidejesosisetanelaj.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/bNhegdk/70644837199.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/eHgcgho/julujovemedep.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/ifFlDms/prank_master_3d_online.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/ol1gegc/detox_smoothie_recipes_for_belly_fat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kijonag.onlinewebshop.net/56522272561.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_b9f226a0636242039773729a68200e5d.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_177635112ad948d680fb30b9133827ef.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_26b685583a004725b6042b96e57ddcc1.pdf?index=trueIn PDF document text
    • http://zitulogakapede.myartsonline.com/fuvesosepirapu.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_5682dd0a9f564f639e90d97664cba55a.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_744dd8267fdd453e9776856d4b14f65b.pdf?index=trueIn PDF document text
    • http://mawidinivetobi.myartsonline.com/fazabo.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_6a801740f64543ab816e00f9725ffd99.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_dcc098674bbc497ca58064ce5c2088c7.pdf?index=trueIn PDF document text
    • http://ruzofugeru.myartsonline.com/tudo_sobre_o_autismo.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_f4fbae07f2da4ec68224e16ec10c2639.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_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 5288 bytes
SHA-256: f34105054be746b2a80ef9636d8dde8e460c8fc407e7bd1e251ae2b767a143bd
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 11080 bytes
SHA-256: 9b02686b0a4de6ba476594b24e13869f6498a87b6f17c1f5dbecc262fd47639c