Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fedc59affcd2d7e…

MALICIOUS

PDF

118.6 KB Created: 2021-03-30 07:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a481573742061b458d07cbd52396e25f SHA-1: debd283ff644737ca9dcf201451154fed2f0f49f SHA-256: 3fedc59affcd2d7e9e852674dafa8e02dcfbc53d392a827637c103b47de74c6d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The primary URL, 'https://ponafet.ru/strik?utm_term=what+food+to+prepare+for+thanksgiving', suggests a lure for users interested in Thanksgiving preparations, potentially leading to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://ponafet.ru/strik?utm_term=what+food+to+prepare+for+thanksgiving PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411683/normal_5fe875def0630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_603ff1d055d78.pdfIn PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/nuroliripupelo_vixusawodir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6016fb155f933.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/lumotupulureme.pdfIn PDF document text
    • http://findssldz.xyz/annabelles_fantasy_tea_break76pjl.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/firemepifizeleruwafav.pdfIn PDF document text
    • https://segoluremu.weebly.com/uploads/1/3/2/7/132740478/479bdc59.pdfIn PDF document text
    • http://roman-holidays.shop/77295884275pmm2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/012f8fe3-8d00-4f6b-a906-efa6025090a8/54664446987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b9d1ca-5a31-4d6a-a644-74a5aea39ea9/does_stretching_prevent_sore_muscles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6015cff2-d33f-4e34-8f56-5a785a1ecccd/52455374678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa888eb2-27d9-4ea8-a7eb-08043515a923/logegusij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da94289a-a5d0-4fac-86a6-f13c63ffb304/rebajakanop.pdfIn PDF document text
    • http://ruwozubusa.epizy.com/82256926658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769096e7-ed8d-46f9-b2f0-d6b1e00b4c91/first_alert_explosive_gas_and_carbon_monoxide_alarm_error_message.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421de450-a56e-4051-b1f6-0013b286df91/88126126124.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_off00017a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6F 5408 bytes
SHA-256: ed539cc22653a0cc0a954c253411d01725e5c8e1f152975618e8077ce9e726b5
font_01_sfnt_off00018ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE7 13352 bytes
SHA-256: 2a1bb4b41536d566aa5880610ef963c7a24f096f020b8f84ab532eee876910b8
font_02_sfnt_off0001b8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8FF 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330