Malicious PDF — malware analysis report

Static analysis result for SHA-256 2801454e7ebc4929…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 11:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ca5e2e7907e08f153fa71ac78dc4660 SHA-1: 5a1f7206ccec0ca0bc49ff12823619e4d722de6e SHA-256: 2801454e7ebc49291ca8c3d5a272f2f6bf5e36693d0f3914b23af334c8766168
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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/award?keyword=how+to+charge+nikon+coolpix+s3100 PDF link annotation
    • http://newuwedeza.mypressonline.com/rugakunapamekirazafoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_601ff1c76d80a.pdfIn PDF document text
    • http://adv-workshop.site/51889966008t4anu.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/what_is_social_inequality_simple_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ghgijaA/download_game_real_drum_heroes.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/how_to_design_and_evaluate_research_in_education_7th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupedoxut/ThdnFjd/92166338342.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/bu0ijhj/49432829702.pdfIn PDF document text
    • http://kihepc.xyz/us_army_sniper_shooter_mod_apkppmi8.pdfIn PDF document text
    • http://limons.space/html_css_table_row_padding77nst.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/hghjie2/pasofutorisuselufiwuma.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/hfhchas/toketarotuvagupekari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_6010f0031bb6b.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/body_language_pictures_with_meanings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_602fc4f6aac12.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/pazovugal/ctet_exam_2018_answer_key_paper_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/5710015167.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_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 5740 bytes
SHA-256: ceea98a40dfa5b22f5c8a3966263009b14b73590d077779507dc03490d5d29f2
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 10948 bytes
SHA-256: 61957ebfce6c61a88a5d03ff106b066491df6a1113a49f78a0740f000396b088

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