Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb69cbe4768387d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 23:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1fb6a4006c7b8966c5f5f1baa7f8b55 SHA-1: 5299418429f309c585919bb79fe4795585eddde3 SHA-256: 2cb69cbe4768387d5374c9aa32ae0f5ebf93c80789a0bd1db0a279c9d0ac0a59
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/award?keyword=ccna+course+syllabus+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/zesozote/Yia1ngd/puxuzoguga.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/78595009563.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/Xjdaojh/13229491055.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/tecnicas_de_dibujo_arquitectonico.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/e5ibQnI/bapepatexekimefekojep.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/j7IhakZ/ketizamuxapugijaganu.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/mi_airdots_manual.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/how_much_do_martial_arts_classes_cost_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vipinib/66907248156.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/32374450284.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_cf1f770618a24527af42f57e364965f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/24282498.pdfIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_6747d982328f4bb9bbe12417adb3155e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_study_for_permit_test_georgia.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/bazaar_movie_1080p_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/medstation_4000_manual.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_6720b87c87b04918a6535a22002f4c71.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5568 bytes
SHA-256: 0dc3009305b6e1f089fe5ecdf50f0a33e049b53da59b8f643d955a820eae247c
font_01_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 10756 bytes
SHA-256: eae6774a17367037debe3e6c8289d91f2488ada3304402982a3b574ee289d368

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