Malicious PDF — malware analysis report

Static analysis result for SHA-256 b556fb2f143315f7…

MALICIOUS

PDF

87.0 KB Created: 2021-04-07 16:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d69e88c250cafa357bf4cce1b3c4a9ee SHA-1: b0f155dc4f6526e2b0bb863a4ba910b5f4b4f501 SHA-256: b556fb2f143315f7eb99f1d9b5a4cb7d2f5f34c549d61410536500296a295291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of external URIs and the overall heuristic profile suggest the document is designed to redirect users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/123?utm_term=physics+force+table+lab+report PDF link annotation
    • http://help-copyrighteamservice.com/fazil_arabic_date_sheet_20195laiy.pdfIn PDF document text
    • http://iciapp.xyz/jubepipexisibevomol09ynh.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/best_solar_battery_tenderh86cc.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/2435344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff978d3bcc7f.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/python_3._7_2_free_64_bitnabuw.pdfIn PDF document text
    • http://lolkek.xyz/bowafogixulibu6q2vr.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/8362804.pdfIn PDF document text
    • http://infonewstravel.com/binusazedu4gv88.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/jiwekukidanuxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_604a02865cef4.pdfIn PDF document text
    • http://hq-cleartv.info/lean_organisation_management_techniques_level_2_unit_3_answersei164.pdfIn PDF document text
    • http://topcreditmonitoring.info/cake_pops_rezept_ohne_formykjx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6047b02779a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_605654e411836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozifep/thetford_toilet_cleaner_spray.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/10122127213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4ffb4b-611a-409f-9d22-c2137e9f05c9/kaxukugadizaritelojuguki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a297dfe5-4d59-4d1a-b7ed-3f35ac240eee/nuparilelizoxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465c266a-0c22-4484-a084-11dd3fea8f3a/32261143552.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/59148065887.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/gofulumubazadaz.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_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 5348 bytes
SHA-256: 18bcaf53e8da56eee3d31937919608d8136269e3101c9796757eaed5519748c1
font_01_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 12436 bytes
SHA-256: e5f6a77b8b4e4fb8b9d4c1e8803a7ea77f67b01dc7d9e2caa450d17e91a591f5