Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bf2c8ac2dea39b…

MALICIOUS

PDF

69.0 KB Created: 2021-02-22 00:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5dbbbc9500940ec937121e18d48ebd4 SHA-1: a273ead08bdcde9b940137696f5dd564b1304e9d SHA-256: e4bf2c8ac2dea39b2f31aa33cfa1865d92485efb6f06c10b67bc0951bcd0ac82
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high heuristic score for being a link farm on disposable hosting. The embedded URLs, such as 'https://jottigo.ru/wix?keyword=the+cask+of+amontillado+reading+guide+answer+key', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=the+cask+of+amontillado+reading+guide+answer+key PDF link annotation
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/1719690.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/0784ff9.pdfIn PDF document text
    • http://widevuvi.22web.org/zomekigutikexino.pdfIn PDF document text
    • http://lefomasa.22web.org/nobifepe.pdfIn PDF document text
    • http://nabokuwaj.iblogger.org/dairy_farm_project_report_in_marathi.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/5505986.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/4769137.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/0d80c.pdfIn PDF document text
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/nokukudupovafizulel.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/pugaz-difoviwubuvesis.pdfIn PDF document text
    • http://dostafood.xyz/pajuleklm19.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/kYsjpji/skydrive_flying_car_japan.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/gukuxapopikabew-jopopesapapumi-nuwim-vedipimijena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 5640 bytes
SHA-256: 22de38b1690369358ca79132a6ea9722d49302672eee636954c6b4e1c869df60
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10036 bytes
SHA-256: c6fb0e4cbb939a6650e9df8f4cc0bb481e0eba022161b7a741079869d655c6ba

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