Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed57944712aaccd3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-16 11:17:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 700809d50146e06e85c842a84446353b SHA-1: e88b7c44670669d0d682659fdc8dbe84a7b84369 SHA-256: ed57944712aaccd352dca2e3340747bb6a827f335db0e17329eab107ad4aa7d4
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for unrelated terms. The primary malicious URL identified is dafemum.ru, which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/award?keyword=3d+printing+blueprints+pdf
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/9599710.pdf
    • http://ehaberdevlet.com/qu_es_destilacin_en_quimicahgaxq.pdf
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/3c76d9.pdf
    • http://topcreditscore.info/wildgame_innovations_insite_cell_trail_camerap1wj5.pdf
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/sadoriwe.pdf
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/serufagasinugi_divixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a4aa6d3a-4d8a-421c-8b0a-cca74c114b65/does_dunkin_donuts_have_gift_cards.pdf
    • https://s3.amazonaws.com/dinisemowoge/42537688712.pdf
    • http://movunulegutowu.epizy.com/theory_of_relativity_musical_score.pdf
    • https://uploads.strikinglycdn.com/files/54a94e91-52d1-48a2-8b57-54e618bc1236/49637293663.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_141a2c56000d4fa3bbf6bdc3fdfec471.pdf?index=true
    • https://s3.amazonaws.com/sazomo/zedulinataxatumod.pdf
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_5e7e83f943974c1f8831e311346d356a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67d29440-6439-489e-a3f6-c2569cafc0ac/law_enforcement_sniper_training_texas.pdf
    • http://kidereludabiron.epizy.com/superannuation_guarantee_levy_an_information_paper.pdf
    • https://uploads.strikinglycdn.com/files/02e21088-655c-41a4-933c-7770234d9516/what_happens_if_you_pour_concrete_in_cold_weather.pdf
    • https://s3.amazonaws.com/fajonubinomeder/best_navigation_apps_for_android_offline.pdf
    • https://uploads.strikinglycdn.com/files/264f18c6-3b4c-4966-bc9b-782f14759ea9/vujorogogas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef51.bin
e7013fead847cdfc057f728701b383b1e37a3ef58ee70dc7bbe4785bbe167c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 5208 bytes
font_01_sfnt_off00010115.bin
3e90d26741189bf542dce20565ea0422a4968f393260cb85d2e183c9954c8151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11084 bytes

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