Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a521a8d8e46758…

MALICIOUS

PDF

78.5 KB Created: 2021-04-02 08:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 39becfa6ea8f4a826bf0e41f63cda9d4 SHA-1: ed93d995a51ab0e455203a0b67e49354d2870236 SHA-256: 02a521a8d8e467580b7c23dc17611cc72b803421ae53902e2dc69d2111fe6acb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL being part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to job appraisals, indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=job+appraisal+example+answers PDF link annotation
    • http://gunepevoxop.66ghz.com/circle_equations_worksheet.pdfIn PDF document text
    • http://sorumokujegir.iblogger.org/anti_personnel_mine_ban_convention.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/63743679171.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/vocabulary_for_ielts_anneli_williams_free_download.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/jipukunuxipirazetabak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_605b62ae829ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_602b23f35e33b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6035e8083b55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fe4a09eaa768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rizokog.rf.gd/company_of_heroes_2_best_artillery.pdfIn PDF document text
    • http://ribebipewafiwas.epizy.com/blank_clock_face_template.pdfIn PDF document text
    • http://gogolozumer.epizy.com/game_circus_nes.pdfIn PDF document text
    • http://miledekulimikem.rf.gd/catalogo_de_cuentas_2020.pdfIn PDF document text
    • http://borogibapomad.epizy.com/mink_dissection_lab_report.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_f06989d1483845fc8455bc28b911a877.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_d400a992d8a847c98a4b52d30fbb3980.pdf?index=trueIn PDF document text
    • http://nojudadosuzaxi.rf.gd/hanoi_map_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/63871393658.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/2803395846.pdfIn PDF document text
    • http://semunolet.epizy.com/manuale_capture_nx_d_italiano.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_a39d67acbaa24575a48e6b636676ac16.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_9089610cbf314f1da81387fa24ed76ed.pdf?index=trueIn PDF document text
    • http://vefagukolile.epizy.com/sobetesesepe.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/tepexawiwovewuvoro.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5252 bytes
SHA-256: 3d16aefa5cd49458d2ddca0cffebc37782123b040cbfc6e6cd580a062366ed05
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 10572 bytes
SHA-256: c38f0d3c5bed3c9a40b66cafb49b052ded06912b9d0e162a91ad2d91945947f6

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