Malicious PDF — malware analysis report

Static analysis result for SHA-256 956c5397f44d7d6d…

MALICIOUS

PDF

93.4 KB Created: 2021-03-17 03:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a0ec804fd083552410cf237a8f1a9de3 SHA-1: 99de0bbccf4338915ea5f847db807691349cb06e SHA-256: 956c5397f44d7d6d3e4cb8b5f64042997dbc572226039b7a05252aab3df9c715
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=pema+chodron+tonglen+quotes PDF link annotation
    • https://cdn.sqhk.co/lisesemafo/jhjcVhe/paxulipasikakewewa.pdfIn PDF document text
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/xawajuro-tisosasukopef-nexewamebu-tomaj.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/rigekolotezun-pakepifu-jobusavopelin.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/86688310868.pdfIn PDF document text
    • https://cdn.sqhk.co/wituwuxevef/hfuhigd/kemidogukezubexe.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/JLiaOjw/ninilofozesapeme.pdfIn PDF document text
    • https://dutatofe.weebly.com/uploads/1/3/4/4/134471766/7112918.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/ramar.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/carl_g_jung_libros.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/widipamovas.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/tintern_abbey_summary_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/ihV8hj2/nail_me_to_the_cross_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/9ghBNHX/al_kahraba_fc.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/4f482a28.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/gamovoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofolimuri.myartsonline.com/english_to_tamil_dictionary_free_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/guidelines_for_taking_passport_photos.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/19339468381.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/fatudipotukorelidoju.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/78005843985.pdfIn PDF document text
    • http://jimarol.myartsonline.com/how_to_use_a_dremel_multipro.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 5480 bytes
SHA-256: 5fd4afd478fae6713aebaa9d773aa3a78201655f11d89a29e20058af617dd4be
font_01_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 10196 bytes
SHA-256: 5f505948e3bfb2f6d0e7ad6262e32d0d6cf43f0eaa24caa8b2ca102b36017c5b
font_02_sfnt_off00015257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15257 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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