Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbe81c00e9a16a7…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 08:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 78a5f84140107d7120f9bfe622298b2f SHA-1: 7e912b20c2a083e33e95a23022e5dbbcfd097d02 SHA-256: ccbe81c00e9a16a70dffe034e3e7eac030795e432dee8d3a0280f9007f472334
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=article+worksheet+for+class+2 PDF link annotation
    • http://b2b-servis.ru/gagagokidibimekutatulujidfwjv4.pdfIn PDF document text
    • https://jamoniti.weebly.com/uploads/1/3/4/4/134486399/dibewafi.pdfIn PDF document text
    • http://winoraama.site/is_all_the_bright_places_a_romance_bookuoq4a.pdfIn PDF document text
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/nimadomalojokafesofo.pdfIn PDF document text
    • https://panonalosisewe.weebly.com/uploads/1/3/5/3/135316392/jesal_nesozozagafisi_gufozipuxetexo_fawugive.pdfIn PDF document text
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/35008ce92ef1e8b.pdfIn PDF document text
    • http://pulaketuwogeza.22web.org/delivery_challan_format_in_gst_act.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/xijudabuj.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/450260d321.pdfIn PDF document text
    • http://osmosiotzs.fun/vutolutefosojodogo1c9.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/tipujenatetirepoxibo.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/d69a7c325b6.pdfIn PDF document text
    • http://checkmycredit.info/transformation_of_galvanometer_to_voltmeterzprz7.pdfIn PDF document text
    • http://lnstagramverifycentre.com/18505457871k6uql.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
    • http://xuzujokavagud.epizy.com/xapodavimil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78338578-578c-4e0b-a56a-f95bbd7440dc/vogawufijuwuzokumupula.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/motudomumidakepu.pdfIn PDF document text
    • http://fujesotes.epizy.com/zupapevolane.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/95684538075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c55dbc-b918-49d6-afb4-a5b05883ae7f/81067517128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa33fd3-d6ef-49d9-8920-0c5e13d05dc7/youth_basketball_offensive_plays_against_zone_defense.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 4928 bytes
SHA-256: defda310175b3d842c204f11a06ad7fbdc5a1c58090abd1121b395bfcefac0f9
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10756 bytes
SHA-256: 54d72d1f4d9da7dccec7f8148b2476fbd6ea9430c344caf797279adfaf9791c9
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34