Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8ba5860c9a92cc…

MALICIOUS

PDF

100.8 KB Created: 2021-02-22 00:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 185f6a470912b36df1751de7b4732396 SHA-1: dc8036a8f0a3598568916dfb101c53719a1dbed5 SHA-256: fc8ba5860c9a92ccf8bf3b298b2a9dd3bdbcfd9d87722faf176cda0eaa127203
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9997

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://maypoin.ru/strik?utm_term=what+is+the+value+of+the+smallest+bond+angle+in+if4%25E2%2588%2592 PDF link annotation
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/vaxuzalaz.pdfIn PDF document text
    • http://blancer.xyz/aareon_ag_annual_reportk6938.pdfIn PDF document text
    • http://juilopkiretlo.ru/self_certification_form_ky9w6ka.pdfIn PDF document text
    • https://mojavopadagesit.weebly.com/uploads/1/3/5/3/135383036/07c81edcbd8fea.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/zAgcicn/junior_graphic_designer_job_description_sample.pdfIn PDF document text
    • http://logvoz.ru/18841128778gzna.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/fuvumako.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/5324982.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/djg35gh/dog_doing_bright_yellow_poop.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/Dhgojb2/tips_for_pk_xd_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/gjdgfhd/78920491356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobuloremade.rf.gd/abnormal_pap_smear_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/11450967598.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/reporte_accidentes_laborales_sura.pdfIn PDF document text
    • http://kitalanexu.epizy.com/dazizawabariragidixojewaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/13267944976.pdfIn PDF document text
    • http://tawexega.epizy.com/5867183319.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 5560 bytes
SHA-256: 467747647a4726edc70f7847625ab4f6340606dbf8f304437305739d48949ef6
font_01_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 12516 bytes
SHA-256: 1fed40a251246211bd6b8b17a8f5e4db9881ec3e55b18c1da5f79290de12c09b
font_02_sfnt_off00016da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA1 16092 bytes
SHA-256: a2ccb5d48230d7d8f448e6249ab49e399f57495b0900213d943f46bdfb0efea6

Open this report in the interactive analyzer, or submit your own file for analysis.