Malicious PDF — malware analysis report

Static analysis result for SHA-256 2667944537304c64…

MALICIOUS

PDF

80.8 KB Created: 2021-05-20 01:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d5f2b66c59b46d5741d0d00d7debc35 SHA-1: b1639fceebf48d2d8201a9252bd7667816f478ea SHA-256: 2667944537304c647eb6ff3c4c06bd61c88d2a1418b9c26928206af2484d7f52
186 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 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://nipisod.ru/strik?utm_term=low+carb+indian+vegetarian+food+list PDF link annotation
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/vukovalolebipujo.pdfIn PDF document text
    • https://zapedumukovig.weebly.com/uploads/1/3/0/7/130775012/d1d356a8675bf.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/wuxadirede.pdfIn PDF document text
    • https://bisulejejokix.weebly.com/uploads/1/3/4/0/134042342/2036715.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/norijavataxijut.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/2ff1904a37f.pdfIn PDF document text
    • https://xudowiwigikit.weebly.com/uploads/1/3/4/4/134462868/9d5b54a6e238d5a.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/5188591.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/mavixu/nukirewexasuzanurag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f799e1c-99db-4641-ad84-8bb8c9faf226/microsoft_excel_chart_templates_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/96072324371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83704e0f-1b03-4b0b-9c9a-19202aaa5fd1/56804842343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d48d6e-b723-4822-8633-db9e904a8d68/liperizonenol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbadf9e9-5bbf-48ee-8316-7425a926ff00/32486072930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d496e8-acb0-4e03-ab12-90ce8c2336b6/sikanizurobesozipufona.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/calendario_serie_a_sky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4cd493-42bf-4bc6-961c-b4b0d8ad4808/81393759366.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/riganariweworemigoriloz.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/13508751175.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_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 5208 bytes
SHA-256: 848e4eb73c1152117703fa93e3d12f6b75dc198af7f7e5d7036f239b99dbcc7a
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10420 bytes
SHA-256: 4e26f84abde85c21b57d63f1ff78d8897456f66a436ae4bb2f439a32a440eb71
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333