Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b900a3b6fdffc2…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 03:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8aec11e34adea0577e4582dc4ad9d6d5 SHA-1: e0ac3cb41df33b7a715ca09a13a8bd7eb1f621e9 SHA-256: b4b900a3b6fdffc23d63afb93c6926c0f3863ef18a02c591b0d1aed752e7768a
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm and by ClamAV as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily corrupted, contains keywords related to sustainability, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=sustentabilidade+responsabilidade+social+e+meio+ambiente+pdf PDF link annotation
    • https://bikekifo.weebly.com/uploads/1/3/5/3/135304891/koxotasuguvefugug.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/8343112.pdfIn PDF document text
    • http://ndfnasg.xyz/mistborn_book_1_free_downloads3w6a.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/ihAHKja/gwent_the_witcher_card_game_ps4_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/be54hhc/armorsmith_guide_classic_wow.pdfIn PDF document text
    • https://cdn.sqhk.co/votijavos/hahenQi/alaye_sitralaye_song_free.pdfIn PDF document text
    • https://zivodigogugev.weebly.com/uploads/1/3/4/6/134664532/23de78e193b2d.pdfIn PDF document text
    • http://csxmoney.info/396694274789es2f.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/hiNhaje/68584278120.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/kiwovilibepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_afef33b3753742d6890c77bb35ea61dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87a67fe-4814-4488-a6d9-0e79a0fbfaca/gugipidilatiganutekuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c36468-8092-40bf-886e-424302ddd039/dijepada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9b3daf-2a5f-46ab-973e-f1aac9a8f389/60326466886.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_44862e6a2d944168b8a2c83f403ad775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/cinema_4d_free_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/imperative_of_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d523703-548d-4cd5-b43f-302e65c24e55/solavutijovuban.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_dc71da07611d44d68faea440d7b9bf49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/broan_range_hood_light_bulb_change.pdfIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_8464509e382c45ddbc394bd632f51bd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/situpujejovafase.pdfIn 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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 5544 bytes
SHA-256: 22f67010ef01fc90d26b0b70e8687097cd3ef8d4306ec79e1fd7a0136409655c
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 13268 bytes
SHA-256: c9082f857d60d2b1e7ead5ad00b4bf78809993934dac0443429bdafd66d8f616