Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ad42487ebfcd7…

MALICIOUS

PDF

82.8 KB Created: 2021-03-05 06:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7b3142778fef76539aeb0d51db4c7198 SHA-1: d9e9dc4af1eb8d12845f335083594fc379eca079 SHA-256: df3ad42487ebfcd7f58296b23e2d8426d2f30114d28b657e0422bbe3c811acec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') and another to a link farm ('vugiris.22web.org'). The ML classifier output of 0.999722 strongly indicates malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wix?keyword=descargar+apk+tubemate+2019 PDF link annotation
    • http://vugiris.22web.org/79957063027.pdfIn PDF document text
    • http://regsenatvumen.website/dodubitufokazorerelyjyvq.pdfIn PDF document text
    • http://jazeforip.22web.org/7098709146.pdfIn PDF document text
    • http://klyshsheff.xyz/digital_microfluidic_biochipsfq7h8.pdfIn PDF document text
    • http://securespot.ru/39125991348gcnsc.pdfIn PDF document text
    • http://ek-arenda.ru/dvdms_portal_biharcqutp.pdfIn PDF document text
    • http://votinegabes.iblogger.org/washington_football_team_schedule_2020_printable.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/woxivapakepinarirovor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobemodorujo.rf.gd/bully_2_latest_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1070e6-e837-49e1-98c7-094e5634c735/bawewijikakodiguzozokaruf.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/gasket_material_sheet_napa.pdfIn PDF document text
    • http://jukerozugixejad.rf.gd/54361751398.pdfIn PDF document text
    • http://vuvumotelikev.rf.gd/latajikudifupifokuza.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_ed684744163342c4aa7602bd85ba5e30.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_c85ed746d8924253b3fd6c713d5c4571.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_35411ea525334e75b9fcd495ce381fa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75aec25-070b-4f5d-87bb-ca452c89b6ce/is_organic_chemistry_harder_than_inorganic.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/17639287628.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_984c4cc0d91342a7911bdadcf57e27f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/google_adwords_exam_answers.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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 5904 bytes
SHA-256: 65747f088cf339a4072aeb1a0c519f0156d8c8a25665ae22fd3d35b29e20a6bf
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10584 bytes
SHA-256: f062e0ca46df5cfdd7a3a129c9ab99c7a5bb1419b3d0bd720c9ef07c08b8da10
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16076 bytes
SHA-256: 7348a63ea9206f1dd9d85ac5b8e77a4d6d13d552d707fc8209e912c0db264539

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