Malicious PDF — malware analysis report

Static analysis result for SHA-256 925bcbcde8a86e51…

MALICIOUS

PDF

122.2 KB Created: 2021-03-28 15:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d73cab37a3993f2d1113111c508f2aa SHA-1: 260e1c31d0c183b742b960eecee5331d5e070446 SHA-256: 925bcbcde8a86e51934fb75c200ccae738b44da2d18adca2f0dd5dcef83f0fc6
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 point to suspicious domains or are part of a link farm, indicating a potential SEO poisoning or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=urban+basketball+unblocked+games+77
    • http://xutifufaxe.mypressonline.com/guillain_barre_syndrome_treatment_guidelines_2020.pdf
    • http://zanovekolasin.mywebcommunity.org/73573420390.pdf
    • http://vigikigopaloze.medianewsonline.com/titelos.pdf
    • http://fufirewavit.getenjoyment.net/16552288513.pdf
    • http://rexevivejegox.scienceontheweb.net/cateye_wireless_manual_strada.pdf
    • http://pasozabijegigus.iblogger.org/tebojifewazofifosabu.pdf
    • http://volosaty100.xyz/britax_marathon_70_g3_weight_limitzefbw.pdf
    • http://momezalomakejo.22web.org/wasalulilon.pdf
    • http://fortuneocredit.com/16495253547g65gi.pdf
    • http://sowinod.mywebcommunity.org/cardiopatia_congenita_en_lactantes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xovekolamoxe/vajutekonojanufaxolotegev.pdf
    • https://s3.amazonaws.com/lusabifef/how_to_write_a_play_script_for_grade_4.pdf
    • https://s3.amazonaws.com/jenagubadopi/65852549117.pdf
    • https://s3.amazonaws.com/kubafezin/79210956925.pdf
    • http://mojogoralil.onlinewebshop.net/memijedumutilaguloxofowof.pdf
    • http://momebemobife.rf.gd/vododu.pdf
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_2178a54a43554bef9f9927140965e246.pdf?index=true
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_6062bcb83fbb40f2992c3c44972654c2.pdf?index=true
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_b848817770b846609af2759826df92c2.pdf?index=true
    • https://s3.amazonaws.com/wurivuve/maxefuvavez.pdf
    • http://mafovito.rf.gd/examples_of_assumptions_in_research.pdf
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_4c9a99cc4b1145709b533aae64b53903.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_off00019fa6.bin
6cb9e313d3a8ddc69f897d6a298ad7d48ae6f14425e298fe10602b02bccbfdd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA6 5532 bytes
font_01_sfnt_off0001b26a.bin
3c886b09aa07faaca51b7d9878673f2d4ec12b9d598a935aafce19c97ed4c2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B26A 11920 bytes

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