Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44bae00ad345bb3…

MALICIOUS

PDF

74.0 KB Created: 2021-03-17 01:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1ff4be096f138d9dbbc909d5e7566d23 SHA-1: 92cc2ef8e6eebb554dc5e0131ffc058cc7d619d8 SHA-256: b44bae00ad345bb38166b2271d459f53226258f418d0e39a8854264e7a2877af
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are strong indicators of malicious intent.

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://nipisod.ru/wix?keyword=onion+cell+mitosis+worksheet+answers PDF link annotation
    • http://jevafurevozu.mygamesonline.org/lukudekizulelelamomupaju.pdfIn PDF document text
    • http://fesofiwig.22web.org/how_to_use_evening_primrose_oil_to_conceive.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/counseling_the_culturally_diverse_theory_and_practice.pdfIn PDF document text
    • http://refowozawigut.22web.org/44127639937.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/sesizizoninure.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/perisher_australia_snow_report.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/76812345888.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/bomupi/90151355347.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/60723294932.pdfIn PDF document text
    • http://vozekalazasof.rf.gd/32885211673.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/xukuratizebuge.pdfIn PDF document text
    • http://xoxemofunox.epizy.com/present_simple_exercises_online_with_answers.pdfIn PDF document text
    • http://tumoxotakim.epizy.com/46075298749.pdfIn PDF document text
    • http://fopevuvowixapa.epizy.com/vanilla_wow_alliance_leveling_guide_addon.pdfIn PDF document text
    • http://geketugasu.epizy.com/aua_guidelines_2017.pdfIn PDF document text
    • http://faperolakaf.rf.gd/zuwod.pdfIn PDF document text
    • http://tebalakafepikob.rf.gd/dabegufosopunujotegofi.pdfIn PDF document text
    • http://katutexe.epizy.com/aryavarta_chronicles_kurukshetra.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/descargar_el_hobbit_2_latino_mega.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5220 bytes
SHA-256: 93ec4390a55c6a9a86a930243138dce7288e12d916eedd5d7f63bc849666b9bf
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 11000 bytes
SHA-256: 75e5217aa2462e126e9d1a73c57fd122ab13717867d64e391971cf4bcd110412

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