Malicious PDF — malware analysis report

Static analysis result for SHA-256 387744b0de699264…

MALICIOUS

PDF

82.3 KB Created: 2021-04-05 22:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6afe547b28478428f54f768f24e945a6 SHA-1: 6f3b0d8d9543171f76e114186100e31002a65d74 SHA-256: 387744b0de6992645916c8590bd9d807dba9a6a0000dfcc997bfe0ee47af088f
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious URL identified as 'https://resalured.ru/award?keyword=a+room+of+one+s+own+analysis+pdf'. This heuristic, combined with ClamAV and ML detections, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://resalured.ru/award?keyword=a+room+of+one+s+own+analysis+pdf
    • https://wisemawuperu.weebly.com/uploads/1/3/0/7/130738751/fuxadidi-nerov-turerile-jasexanebogez.pdf
    • https://wifebazeb.weebly.com/uploads/1/3/1/4/131482826/4617446.pdf
    • http://jiwabozaxexe.mypressonline.com/75251725291.pdf
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/pukizaz_toxekobepex_vukopewogupuji_kowobanot.pdf
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/6191455.pdf
    • https://lexeparuma.weebly.com/uploads/1/3/1/3/131380616/016a3.pdf
    • http://koxivesuvif.mypressonline.com/foginalovobaweg.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_6052df96380ca.pdf
    • https://kobekasi.weebly.com/uploads/1/3/4/5/134588699/jebovafufud_jemiz_saxavol.pdf
    • https://rodefakuwutepez.weebly.com/uploads/1/3/4/3/134341390/b84d9d559329125.pdf
    • https://static.s123-cdn-static.com/uploads/4381756/normal_6007a7055ade8.pdf
    • https://static.s123-cdn-static.com/uploads/4417414/normal_6001125400f0e.pdf
    • https://cdn-cms.f-static.net/uploads/4489414/normal_6039fc0f664e2.pdf
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/6416688.pdf
    • http://fituxem.sportsontheweb.net/linezepodu.pdf
    • https://cdn-cms.f-static.net/uploads/4460076/normal_6061248dd098c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/598fe37f-bdda-43da-9f03-4b40d76efc71/beradevurin.pdf
    • https://uploads.strikinglycdn.com/files/89203646-0b16-4f08-b2c5-c9e8a27680a6/can_you_set_a_passcode_for_hidden_photos_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/91a6aca0-1acb-41ad-b3b4-457e83d33224/tc_helicon_voicelive_touch_2_used.pdf
    • https://uploads.strikinglycdn.com/files/bd7bec26-0962-4d20-951e-a0ea65c15f8c/59989127865.pdf
    • http://xijewixevav.onlinewebshop.net/do_you_have_to_read_the_how_to_train_your_dragon_books_in_order.pdf
    • https://uploads.strikinglycdn.com/files/51a612e1-48dc-4478-b87e-b3baa993f564/gelazobo.pdf
    • https://uploads.strikinglycdn.com/files/0e2e0eb5-214d-4758-97bc-0577860180ac/41556529663.pdf
    • https://uploads.strikinglycdn.com/files/bc29f092-c9f0-4c19-b8ae-db1846919aa8/pioneer_deh-x6700bs_manual.pdf
    • https://uploads.strikinglycdn.com/files/448b9e7b-31bc-418a-8f9c-4359bfb7d97e/55908688089.pdf
    • http://kofaxafogi.myartsonline.com/10402460457.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_off00010530.bin
ed6abae99abfcbf31d10c5bdae7487696e16606ecac4802b4aca607eeeda2e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5372 bytes
font_01_sfnt_off00011775.bin
63b54b6781fac616d966d494813c0dece63ad54addb9c672c2b0e39b5f4839d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10812 bytes

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