Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b6a9753568a7bb…

MALICIOUS

PDF

72.8 KB Created: 2021-04-05 16:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c5bbafffb1fe9d43e33de1d5354e523 SHA-1: 7ab068b99704356f4fccb8479a8d2d8f7ad53311 SHA-256: 33b6a9753568a7bbd6b1c87516c636732fdb12ce90118bc6fa080e5a4356e706
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 pointing to SEO-optimized PDF files, indicating a link farm or phishing attempt. 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, likely spearphishing via attachment.

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-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=kausalitas+sejarah+pdf
    • https://cdn.sqhk.co/jamasedese/d9v5aPm/worlds_hardest_game_unblocked_3.pdf
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/9205521.pdf
    • https://cdn.sqhk.co/vimewiki/EVXgcig/jetapatenerumu.pdf
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/2487956.pdf
    • https://cdn.sqhk.co/bilexodofose/geXYmhi/versatile_meaning_in_english_with_example.pdf
    • https://cdn.sqhk.co/talexadu/aueBjVZ/24219065295.pdf
    • http://lemuxatazewazov.iblogger.org/36088622142.pdf
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/gijimuwezu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rufegojokod.epizy.com/agm_agenda_template_nz.pdf
    • https://uploads.strikinglycdn.com/files/6eebd58d-4791-4c93-adc8-84f781b81f3f/tiwikope.pdf
    • https://uploads.strikinglycdn.com/files/f705ceaa-e8dd-46e6-9411-f275c4f1858a/65695188951.pdf
    • https://uploads.strikinglycdn.com/files/802c323b-6eb7-441a-bd99-03561740980e/sig_p226_nightmare.pdf
    • https://uploads.strikinglycdn.com/files/b73429c9-f313-4c77-97df-b6611ee3307f/cie_a_level_chemistry_periodic_table.pdf
    • https://uploads.strikinglycdn.com/files/5ef6272c-e813-4c44-9df5-78bf855473a7/how_many_carbs_are_in_bojangles_chicken_tenders.pdf
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_f3fc4d0b07914fff862f24bcb6eb0242.pdf?index=true
    • http://varoxekoduv.epizy.com/joberunisepejolek.pdf
    • https://uploads.strikinglycdn.com/files/e4f7cb19-0092-4309-92be-475f332c88bc/what_is_the_disney_college_program_acceptance_rate.pdf
    • https://uploads.strikinglycdn.com/files/63cfe427-19bb-41b6-8903-f9614a9fb79d/todd_lammle_ccna_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/d1255f25-8949-4111-80f1-2beca4601ac3/zaralopoxuvexevosevud.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_e480eb0531784607875cdf27ca0406f1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d52c.bin
2fe9775b2e4bb2e9da7b6490053a5803759c3dd2ecf1cb93499c93ecab23da07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 4840 bytes
font_01_sfnt_off0000e5b4.bin
1aeec54f152e407c11b182f5ea34eeb59603170bdaa9e96b92b0e254503b4a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 9952 bytes
font_02_sfnt_off000107cc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 4324 bytes

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