Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac15b5342b5fa241…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 20:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 113cade50eca18a651e60e055c97413b SHA-1: 20c0a43d8fede4e4992ec8f32120dfedac7ea84a SHA-256: ac15b5342b5fa241270f7b4e2e85f8c58dfd1aefbafe88ac2779b560cf2f3921
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure for 'accounting cash book software free'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely intended to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://lozipotod.ru/123?utm_term=accounting+cash+book+software+free
    • https://cdn.sqhk.co/pefisemise/digugfX/mikowegofutesibe.pdf
    • https://giminabev.weebly.com/uploads/1/3/4/6/134601645/difafakikugeguv.pdf
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/5981771.pdf
    • https://cdn.sqhk.co/sumavevop/jaOjfic/javojumeruzemepix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_a555a12ffa7a4264ab5cd7f427397b87.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a34f007-219d-4651-aaca-4bff7017e04f/best_sale_price_on_kitchenaid_stand_mixer.pdf
    • https://uploads.strikinglycdn.com/files/b7bbf968-3c49-45b1-bb04-f44f0ab875d6/60670900722.pdf
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_7eed360f79f74d10beb052aa93581c6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6031af83-f33b-41d8-879b-89cd2d560f87/xurizudemopi.pdf
    • https://uploads.strikinglycdn.com/files/c43853af-bd60-4dfb-808a-0b5126ec3384/adding_fractions_and_mixed_numbers_with_common_denominators.pdf
    • https://uploads.strikinglycdn.com/files/4edb43aa-b67c-454e-855a-9318ecf65832/how_to_clear_search_history_on_google_maps_on_ipad.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_a737cda31da64d8f83f23c10c24e9b3f.pdf?index=true
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_d76b9f32289441309ccc6a090bf22070.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_f63774e2f24f4ca783c038f252a7f42e.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_5870f30041274d3aa96b0a99e8d8f127.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_3d815d3beaca49139e794a2b5566ac33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ff73652b-50ad-43fe-9a87-05f91c373528/jovoposevajudavozu.pdf
    • https://uploads.strikinglycdn.com/files/7ab01a98-29f1-4311-acbd-e13fd754c79f/dudadutalisabisasugem.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_63cabefcbe7a4f07990b170ad6bc3aa0.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_off0000f193.bin
434adc8cfc723b6704214d06f652464febd8021ddcadb6bc1a753cf2b0363448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5396 bytes
font_01_sfnt_off00010405.bin
6656321c34fa1aba84047ae50ebd9aece555571e83e29225beb42db766fffafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 11528 bytes

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