Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab4c5dd5c1968ac…

MALICIOUS

PDF

75.5 KB Created: 2021-02-07 21:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3b65075e669e0fa8db39f6173bde8ce SHA-1: 0f2bed1926ff02f297f0511ebc03a272796335bc SHA-256: 5ab4c5dd5c1968ac8f82f62f989eb49910d7057f2e89baef2f7bb53fa6b470c4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content.

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://jacksth.ru/aws?utm_term=bracketing+in+research+pdf PDF link annotation
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/maxavawepizi_parajirekiboko_vadoburaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366976/normal_5fed541781c04.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/noger.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/91098540995.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/f45c834015a95.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/8d9bbd74bbbaa.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/mutokuneko.pdfIn PDF document text
    • https://fegenogo.weebly.com/uploads/1/3/5/9/135981842/vigimamet.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/belarida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubaviz.epizy.com/musculoskeletal_anatomy_coloring_book.pdfIn PDF document text
    • http://lanadofebanubod.epizy.com/riluratukojurobijedow.pdfIn PDF document text
    • http://fuzariwa.rf.gd/raridiva.pdfIn PDF document text
    • http://vegigekud.epizy.com/tamil_audio_bible_app.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/47942458885.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/rusil.pdfIn PDF document text
    • http://rumusajebal.rf.gd/gonna_cry_meme_template.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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 5500 bytes
SHA-256: d8cf657153a660bdcf35b5c62256e03fdd62de0a0ea145fea1ee8a835dc21d90
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10852 bytes
SHA-256: 814e598a2fb823126d8b9cc2511b926a5f5a49fe68bb6c91237cc2db3711efe6

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