Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89b8937e947d99a…

MALICIOUS

PDF

75.4 KB Created: 2021-04-20 22:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cbb65cee26fe3e70f51ad7024bf7c786 SHA-1: d2b22936bf62305382c72828822bba35f7597e0f SHA-256: c89b8937e947d99a77a9081ebf0ccf840e0c3aa2e32dca9cbe88fae2df4bc677
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious websites for further exploitation.

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
  • 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://lozipotod.ru/strik?utm_term=guidebook+on+enteral+medication+administration+pdf PDF link annotation
    • http://lezirumari.sportsontheweb.net/wiget.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/jedulavapipizuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_6046677186ad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5ff0d8f5b488a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5ffeb246e6e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_604b7a0f86d07.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/network_monitoring_and_troubleshooting_for_dummies_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_603ac7924f20a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_6012525214a3d.pdfIn PDF document text
    • http://punejew.mygamesonline.org/attestation_d_hbergement_bnp_paribas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowepiguxuwo.epizy.com/62167113499.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_ec2ac329ba4344879cbf1836f7325f35.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_50c04c10767345afb3e218c18a7f8b70.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_d3ff45238947465980b1c94d593a9ed1.pdf?index=trueIn PDF document text
    • http://dufojamimusim.atwebpages.com/idsa_clabsi_guidelines.pdfIn PDF document text
    • http://jatixafaduv.rf.gd/twin_balance_sheet_problem_investopedia.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_3a0dbab66a6c4162a8ea35b3bd9ded39.pdf?index=trueIn PDF document text
    • http://nolawasewunut.epizy.com/15902297324.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_d037fcd60f414e4e9b09194bf341b465.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_6f3d5b968db44005a61e9bf2ef19682e.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_712cb957376d499597cae74224151482.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5536 bytes
SHA-256: 21f6c0650306cf49abd9565186f3a0ce58b0097a19d542b96c30f55db2650da2
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10520 bytes
SHA-256: 3805163fe96530d6c33f5d983c854f72df37e08d9819162e821d4616cd7b96bc