Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f090cc7691f8cbe…

MALICIOUS

PDF

82.8 KB Created: 2021-06-12 23:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 95ed36467933e3e0666220b97824c1ac SHA-1: 18fe4dfe2b4582372554b4ab343159e4d56e0ff8 SHA-256: 8f090cc7691f8cbe08799bdc2abf6e0080e33c731c67a37de670f74c6cf2a1e5
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 0.9996

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://irlanc.ru/pbw?utm_term=shadow+fight+2+99+max PDF link annotation
    • https://noriledefokotox.weebly.com/uploads/1/3/0/7/130739853/rujegelo.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/mifajiko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_600204199162a.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/4068982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5feba11a9d4eb.pdfIn PDF document text
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/496cc7.pdfIn PDF document text
    • https://surumovosutimu.weebly.com/uploads/1/3/4/7/134733284/fejuturizokoxafodaxu.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/vefoxofetuvera_xigogifotow.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481173/normal_60aff189ec407.pdfIn PDF document text
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/gufevi.pdfIn PDF document text
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/sisavun.pdfIn PDF document text
    • https://guxosenenizezov.weebly.com/uploads/1/3/4/5/134598055/galuvazijutoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_60b8a27337e0a.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/6271160.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/7532a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492281/normal_60098324ace72.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://uploads.strikinglycdn.com/files/a677bab6-7344-41e2-a485-9ecef7c3e373/little_fires_everywhere_episode_recap_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c6a29b-652c-485c-ab81-1f0a31737fff/52625769541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d5e7bd-e479-4df2-9b44-2af66a833372/sizim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b3b7b5-3d85-4ddd-994c-d7c3bb6f93d3/how_long_does_colace_take_to_work_in_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46378940-2773-4b07-86bd-a7559e97b08d/area_and_perimeter_word_problems_worksheets_grade_7.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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5132 bytes
SHA-256: 6d5806e217078cc499938993255714caf65d525cea4ea00858f62dde0d6562bb
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 21496 bytes
SHA-256: 839088462ac8c44dad519be9709312f0a6862fb60a882eab808026619c00a6ba
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34