Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd258f2bc9e066e4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-12 01:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ef543d146c331d866c86dcc683353f SHA-1: 328730ca65d78a6c13c013f3cdb2970a501b6814 SHA-256: bd258f2bc9e066e44eb07b95f60cda896017814188ada01972563d5bc418c0ce
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://xezojetit.ru/123?utm_term=all+black+chunky+platform+boots
    • https://rafumozapisiv.weebly.com/uploads/1/3/4/3/134314615/regegizanesugix.pdf
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/846241dbbb.pdf
    • https://cdn.sqhk.co/puvubuzu/Be1mFhi/combat_flight_simulator_3_windows_10_patch.pdf
    • http://bizbize-yeteriz.org/bavetegalejo1ti5.pdf
    • https://cdn.sqhk.co/nebemina/djaDqig/nobakifu.pdf
    • http://praktika-ingenieur.com/vepodimuwedexekumasnvpta.pdf
    • http://wiinorama.fun/3866937444763gru.pdf
    • http://woodlesenka.ru/kojuvuzijunifuzumume9nkmq.pdf
    • http://yesitalia.fun/faulty_product_reportcoc8o.pdf
    • https://dewifekezag.weebly.com/uploads/1/3/5/3/135313931/91bf515.pdf
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/d6e21b5c9.pdf
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/02508e6c.pdf
    • http://changepass.online/bisezovawodaboxisajikugogplms.pdf
    • http://gerda-msk.ru/portrait_drawing_artists_australia4pq5w.pdf
    • https://cdn.sqhk.co/zedawuzijis/j1ggiiS/72459075748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pepesilazofef.epizy.com/tosegopofegawiber.pdf
    • http://batofudinub.epizy.com/fewasodutozibuwadoxe.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_024216a2b9144cedb4778969efb5acb4.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_e89de6c16c234a23a1ad83a52e5f0a82.pdf?index=true
    • http://gefexusutem.epizy.com/showbox_4._73_for_android_tablet.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_41863b9d8e794d24812c2e86b3c5b0bf.pdf?index=true
    • http://fevoreselo.epizy.com/xufokibem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67b.bin
468f5edf93685def5c37f98297f8b8ae4f57f0aa545c10256c289136ee2c243d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5264 bytes
font_01_sfnt_off00010826.bin
19ff453e2448b85ee2fd53920bfaa40e3e92f9def9b73157ccdd61ded9c0f491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10720 bytes
font_02_sfnt_off00012cd2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 4324 bytes

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