Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae9476579d1c919…

MALICIOUS

PDF

92.2 KB Created: 2021-03-13 19:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 238144601ede12f6c1e581c0ed866ab5 SHA-1: 81f95a559c20a6c625c232b4bd7e4805cab25b54 SHA-256: fae9476579d1c9193992f9935a40c87a03bb2b2ab027a3f3208941582dabcac5
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or distribution point for malicious content. The PDF structure and embedded URLs indicate an attempt to trick users into downloading further malicious payloads, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=aditya+hridayam+sanskrit+pdf+download PDF link annotation
    • http://buzifun.22web.org/guidelines_on_pediatric_parenteral_nutrition_espghan.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/3601de908.pdfIn PDF document text
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/jokewasarifif.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/IRCLghh/47597961930.pdfIn PDF document text
    • http://sushibara.net/mewarobitumizodimibodovux5rtd5.pdfIn PDF document text
    • http://donbetosstreettacos.com/angry_birds_star_wars_free_shopping_apkm4g9z.pdfIn PDF document text
    • http://skidki-day.site/les_miserables_movie_review_2012udj6e.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/b7dca.pdfIn PDF document text
    • http://checkmycredit.info/6771248621465e3q.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gYgiThb/61113696342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipitor.epizy.com/jilomimawerezofonipu.pdfIn PDF document text
    • http://fagewoxe.epizy.com/76072189757.pdfIn PDF document text
    • http://dodarululi.epizy.com/drawing_atoms_worksheet.pdfIn PDF document text
    • http://gijafusatuvaxoj.rf.gd/73575129850.pdfIn PDF document text
    • http://kixexagejo.epizy.com/microsoft_outlook_android_activesync.pdfIn PDF document text
    • http://xaredekol.epizy.com/lab_report_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_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 5528 bytes
SHA-256: 7ad89c3513a2d9ebc2b496686e9cd9602131b39886baeabd2875538ab06eada1
font_01_sfnt_off0001402b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402B 10840 bytes
SHA-256: 2b9cb1249a053968cf9c03eaac9563515a30ce0f30b964a1b15314a7182b57ba

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