Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8be92b0d2315ef1…

MALICIOUS

PDF

84.9 KB Created: 2021-01-04 21:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3dfb0bd7f5b2f1a61d5771b3ecfebe6e SHA-1: 7ce57bb8a1b0d4a85e09a314738a11a03b271d9a SHA-256: e8be92b0d2315ef115f1c93a197bc8ff5694c0e09e623f11866aeb8c8b3d7808
186 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 disposable hosting services, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=code+128+barcode+generator+software+free PDF link annotation
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/koveluribikajot.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/5988105.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/wulinasexowudumam.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/jjSjfii/xbox_series_x_price_leak.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/1763892.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/8be87e8c7384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdcb481-6ab8-4b7a-a174-aad5a26660ae/29565776165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22879ac4-a885-4052-838a-e7f292a8bcdc/ap_biology_formula_sheet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b302f5da-75a7-421f-8d1b-3efbffc67640/98847524883.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/bowlby_one_sc_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/089087f5-cf43-4184-8e27-cba0aad9498c/integon_national_insurance_company_pay_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/hinduism_and_buddhism.pdfIn 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_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 5672 bytes
SHA-256: f633e0ab52b9537a03a27b30af97495f770c92c1b4d3c4755f880671ab986eda
font_01_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 12100 bytes
SHA-256: 47b2e5a18863d4637afa63c578a995f018e56e18553703ef3fae80e7aaf46303

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