Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b1500aa56d8a25…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 02:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15193e10b03714ea0a5fba201c41142a SHA-1: 647526666f55005a8640c730ca83ff2f355720d2 SHA-256: e8b1500aa56d8a25183933b0f5e1dff9c11933e2855674cd28b0dbe8b2c6a58b
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the embedded URLs, 'https://jumiwimov.ru/wix?keyword=ikaw+lang+ang+iibigin+may+9+2020', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=ikaw+lang+ang+iibigin+may+9+2020
    • https://cdn-cms.f-static.net/uploads/4427273/normal_601faab779035.pdf
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/bubomowawezajoz_fopuwivex_zelag_xugowusoxi.pdf
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/edb6b56ddb3fd2.pdf
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/5906265.pdf
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/645e936423c.pdf
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/bf344ce9ee9e1b7.pdf
    • https://cdn-cms.f-static.net/uploads/4491436/normal_6036ce700c41b.pdf
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/nevakopisig-pilolaripub.pdf
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5ff3f3eda473f.pdf
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/wokopazi_jofugusiwobulas.pdf
    • https://cdn-cms.f-static.net/uploads/4467030/normal_5fd9fccd19166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lezopobigeza/xepusarapibataz.pdf
    • https://s3.amazonaws.com/goneduzum/jasper_reports_parameter_queries.pdf
    • https://uploads.strikinglycdn.com/files/05596375-36e6-4a86-816c-53c0f9af96ad/41799102244.pdf
    • https://uploads.strikinglycdn.com/files/e780bb68-c1b3-4f47-828d-162f0e91b5ec/youtube_avi_format_video_download.pdf
    • https://uploads.strikinglycdn.com/files/0ac4a518-72ba-4786-8251-6ce2cbc9c2c8/what_time_is_stock_after_hours.pdf
    • https://uploads.strikinglycdn.com/files/2b3afb85-dcc8-4af7-bfb7-7f7f01adb60d/john_deere_317_mower_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/6034bd31-3267-40cf-9f12-2a4190694425/8473256464.pdf
    • https://uploads.strikinglycdn.com/files/c750d703-321c-4a7b-a8ea-22670a2eee53/nespresso_lattissima_touch_descaling.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_off0000e9e1.bin
f932a4ee4b5c07eff990c924d148ae0d73512cdefaf6b863839508fe469cd12b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5496 bytes
font_01_sfnt_off0000fca8.bin
1e7f7276264a9e6a30689bc8695128dbf7a9471bce131b75f917b67e8cd35749		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 10332 bytes

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