Malicious PDF — malware analysis report

Static analysis result for SHA-256 28af0c2bab401f4e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 23:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 180e71c38b9b21bb34a426a88e232e94 SHA-1: ff209fea180c99e8bcf1baa20df3055b51c10239 SHA-256: 28af0c2bab401f4e02e01b588dbeb12e744e274c42c729775d5292644989bce0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to various PDF files hosted on disposable domains and potentially malicious-looking domains like ponafet.ru. The presence of embedded URLs and the nature of the link farm indicate an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/award?keyword=boxing+drills+for+beginners+pdf PDF link annotation
    • https://cdn.sqhk.co/dosojegomugu/geWgdyn/89297780929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6014d2aeae04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_60461ed9c0ffb.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/Jsnih8W/firiwowojed.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/vedivoropo-losiritevizuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fcf6e4004d7b.pdfIn PDF document text
    • https://buwefube.weebly.com/uploads/1/3/0/9/130969915/gexonabusazijixasiv.pdfIn PDF document text
    • https://dudenaluwesugo.weebly.com/uploads/1/3/1/4/131453650/jimigubenaroju_bilena_fipuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_5ff7d420a09b4.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/bexukovipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_6024b6025aaf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_6046434cd4000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6041973baa0af.pdfIn PDF document text
    • https://nadenekaf.weebly.com/uploads/1/3/0/7/130739264/luvujomiribowutikim.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/hdgjMgF/basketball_game_length_nba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelujoweda.rf.gd/dns-321_windows_10.pdfIn PDF document text
    • http://dozopum.rf.gd/osrs_brittle_key_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/69828142905.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/fivuzosenolevatag.pdfIn PDF document text
    • http://merawaboz.epizy.com/18675418522.pdfIn PDF document text
    • http://kukuvil.epizy.com/iwatsu_adix_phone_manual.pdfIn PDF document text
    • http://renedutej.rf.gd/apprendre_l_alphabet_coren.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5256 bytes
SHA-256: d5249dbbe7cad575d892502bdaa702f17f3f90723ee60277a7773139cc28d869
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 10548 bytes
SHA-256: 9b845d5fbbebbd76c466153673a9c73614abbd603ed9e7d727c63f8734b0e82d

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