Malicious PDF — malware analysis report

Static analysis result for SHA-256 671247e3152518f5…

MALICIOUS

PDF

81.5 KB Created: 2021-04-29 20:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08ce2c68879000823ab8c0a7fd96381a SHA-1: 13669940ec866ccd763aabea9ba55bedee26ce72 SHA-256: 671247e3152518f5598e3a207d5bf5c7883bec8bf4a4398ddd84069eab58b212
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+change+battery+in+kindle+3 PDF link annotation
    • http://xokapik.mywebcommunity.org/ayushman_bharat_yojana_application_form.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/anatomy_of_monocot_and_dicot_leaf.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/nagorabuvidal.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/250dfc854be01.pdfIn PDF document text
    • http://juluzenaluziwo.22web.org/how_to_install_focusrite_scarlett_2i2_on_windows_10.pdfIn PDF document text
    • http://walujaxe.22web.org/ielts_speaking_makkar_september_2020.pdfIn PDF document text
    • http://rufisurerupu.iblogger.org/resume_template_doctor.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/broken_vessels_sheet_music.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/4660914.pdfIn PDF document text
    • https://sexabadipeg.weebly.com/uploads/1/3/4/6/134684930/xarew_zukuwugaxin_gunoz_tawina.pdfIn PDF document text
    • http://novorawo.iblogger.org/gekasi.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://dijuforuzukogem.rf.gd/how_to_program_xfinity_xr2_remote_to_tcl_tv.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_94cc3dae18ae4009b562a65e4e1068a4.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_c73fb565b6514f63a33113dd56dd1c65.pdf?index=trueIn PDF document text
    • http://vafowoloxesimam.rf.gd/95524634734.pdfIn PDF document text
    • http://folezazav.epizy.com/business_development_manager_job_description_template.pdfIn PDF document text
    • http://xexasuwoxomiba.rf.gd/sesozekilenu.pdfIn PDF document text
    • http://gofokamerutasi.rf.gd/86039874883.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_faf47837c2b7414fb6ffa273f615d18a.pdf?index=trueIn 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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5336 bytes
SHA-256: 3b4f60bc05c5b8def24e26a1d1312a3982bad856cb636672fd9b3be73fba8183
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 11056 bytes
SHA-256: df7f2dd780b3bb20bf3b8b4783860aefc69874a6fb1b9f73f549531cfc4a9f50
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c