Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaefd23125af64f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-28 05:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4036c4e797e89d7143a23d17aaea4746 SHA-1: 5cc6220d44eb99a5f6f4af6469384ab5816a7896 SHA-256: efaefd23125af64f11cffc61db3ea200cefa22089d34c60c855b5abeb9f57d43
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to many other PDFs. One of the primary URLs, 'https://soxebez.ru/award?keyword=spark+3+workbook+pdf', suggests a lure related to a 'spark 3 workbook'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=spark+3+workbook+pdf PDF link annotation
    • http://usersdeviceprotectionservice.site/toyota_camry_2019_se_accessoriesvd3gz.pdfIn PDF document text
    • http://allieshouseofhope.com/892449489011kfvf.pdfIn PDF document text
    • http://tovarzone.ru/warcraft_3_reign_of_chaos_cheatspjmzy.pdfIn PDF document text
    • http://kemytbok.xyz/26259107127r3buj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xarojapi/2389842849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9209be6-09c5-4136-a25d-90baf6eab0de/lexatakizajedufagituk.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/werivudedapafurobinesaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/vifemulu.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/why_is_my_whirlpool_washer_not_draining_water.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/barcode_producer_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db3d729-66a5-4b79-90bf-aa3362f4b7bb/beats_by_dr._dre_powerbeats_3_wireless_in-ear_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3112d9d-ecff-4e91-9748-0bf88b2e7da5/kuvafuxawebafotamezosevem.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/how_to_trade_demark_pivot_points.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_563d71e370b9449b8246828b036e4108.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_60828a4b88484529986fd0cfa4cf77b4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 4824 bytes
SHA-256: 705cac448ed07827454402f317e7deb126e694300c710d5ab546eb7b5db607a2
font_01_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 12304 bytes
SHA-256: 894625aa276a3dd4ab46c37e2ad0e0c204d743f882105cce0abd252d306abeab
font_02_sfnt_off000141ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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