Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cb5f62ffe4d215…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 17:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123a3896ec27c953439f3e567b10c87f SHA-1: a6c0f570a1c5578e3a07f954be7c887b0c02e62a SHA-256: a6cb5f62ffe4d21509f27d9c3b79f0ac2982ee24aba2453b54bd4acb89cc434c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/123?utm_term=cittamobi+apk+5.+8+2
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/nadekibozotoxeb.pdf
    • http://zonitupupafof.sportsontheweb.net/livro_adestramento_de_caes.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/2affd16303ca.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_601199b6af7cd.pdf
    • https://tedibajibivo.weebly.com/uploads/1/3/1/4/131406927/72e64cb9.pdf
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/d4f3e5343d.pdf
    • https://doxezudira.weebly.com/uploads/1/3/0/7/130739714/ziwefev.pdf
    • http://sugameloxufe.mywebcommunity.org/shree_shyam_akhand_jyoti_path_book.pdf
    • https://cdn-cms.f-static.net/uploads/4409396/normal_60182c48e319a.pdf
    • http://dafagaketa.sportsontheweb.net/take_me_back_to_dear_old_blighty_sheet_music.pdf
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5ffae0e3216fc.pdf
    • http://tejowigasinafu.getenjoyment.net/first_steps_in_seismic_interpretation.pdf
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/e615312e.pdf
    • http://jobunileta.22web.org/what_is_fertility_transition.pdf
    • http://farilanij.iblogger.org/rii_keyboard_change_color.pdf
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/ad85105b50ad7.pdf
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/tuvijefimasominuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zegetafirotazaz.atwebpages.com/6987055727.pdf
    • http://mamuwudusaxu.epizy.com/analytical_reasoning_book_for_cat.pdf
    • http://pokupila.rf.gd/comprehensive_report_about_drug_tik.pdf
    • http://porumujowupof.epizy.com/r_bookdown_bibliography.pdf
    • http://vebadivikini.rf.gd/19746435650.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin
c1a6281da09b9288274335de7ff26fb9ef0c1b5a675f3a1546233a1bd6f9e55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5252 bytes
font_01_sfnt_off00010807.bin
6fac8e0757507649c11623349de9cba34e4abdf9e3b12c27f9b9c6ad5fdb03dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 13788 bytes

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