Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a62d19621b246ea…

MALICIOUS

PDF

78.7 KB Created: 2021-05-11 17:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae65401b9f5c79bab5beaa5410b2c232 SHA-1: 1da4cf5578f17bd71ba6d086b195f97c32d2b17f SHA-256: 9a62d19621b246ea8533ed483c4e2729b58a350956a5bdbfbcae5b12ccb7b0d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=how+to+fix+kenmore+fridge+ice+maker
    • http://scotiaenlineape-personas.com/379674079710n8ca.pdf
    • http://qiwi-wallet.online/huffy_beach_cruiser_24_inchr3yvi.pdf
    • http://fruittea.space/kiboxenf9i7i.pdf
    • https://videxufukeremon.weebly.com/uploads/1/3/4/5/134504533/9c99c9fe10.pdf
    • http://housefashion.ru/pibemesokerote0q50u.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/b787f2722ed7e.pdf
    • http://lightstart.xyz/best_online_real_estate_school_california_2019buzki.pdf
    • http://criticcxck.space/how_to_cancel_schedule_on_aprilaire_thermostatad65h.pdf
    • http://natnat.fun/how_to_brighten_ti-83_screencah3l.pdf
    • http://honey-love.ru/xefelimajebopusoravwciz.pdf
    • http://upsbox.ru/22311603508v19kl.pdf
    • http://civiliscmq.online/fexejadireajzob.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/fijexebuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_d93b3765126542408e4ee3b6ac4266a6.pdf?index=true
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_cef2378ce5fe44bf809b23c9a5f71ee9.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_b8a37bea54f34b25b374acfb0fc3120d.pdf?index=true
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_fa4fe7223e8e4cdb831348b959fedbc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3cf36a77-a928-417e-9c5b-58a9c9d9a487/sexobego.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_a909052863ef46ffb4e6323d4ce5101d.pdf?index=true
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_130f2664cbc940ee960e3775f7652548.pdf?index=true
    • https://uploads.strikinglycdn.com/files/872328f9-ebeb-48a7-83af-ddb8d74d1c35/carbon_dioxide_is_a_waste_product_of_cellular_metabolism.pdf
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_fd6aeb7fff0d46b995ea4ce022707c70.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa1850c5-71e5-4218-91ad-6759aea81d74/71790012293.pdf
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_b6c50bc5e84f4c769653ce56329f4d80.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ccb6d0f06dd649d7b513ebf26c222676.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f658.bin
1bc21c18899e1fdaf8bf5de7ced536809e75faeedcaddfc175855d828fecfe27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 5316 bytes
font_01_sfnt_off0001086c.bin
b59d0dafb059267d0dc201316f5d619590414fac168bad1a8991bc159e0044c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10748 bytes

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