Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fef941bdabf3cc9…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 18:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 965576fed5d39868a0354d90aa839e22 SHA-1: bba0d95f153b3db43df6461657e9917762587814 SHA-256: 6fef941bdabf3cc9be8d5c716f1e32734bdc0d826b4a24248c065f485d8a04e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=leadership+style+test+pdf PDF link annotation
    • http://poposiruta.mywebcommunity.org/vaxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_6000c94998464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_602b871f91663.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/jetamekakuvuborig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_6023eb431bce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_603ea7ba9bb2a.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/esl_library_conditional_sentences_first_conditional_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375076/normal_6006747a303ed.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/wepofokusazitegipedozozig.pdfIn PDF document text
    • http://gifavojam.scienceontheweb.net/67549960680.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/48535872762.pdfIn PDF document text
    • http://rofozazasi.22web.org/alesis_dm10_mkii_studio.pdfIn PDF document text
    • http://votixowet.22web.org/download_hollander_interchange_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabatelekovufar.myartsonline.com/how_to_prove_congruent_triangles_rhs.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/allen_carr_easy_way_to_quit_smoking_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/ham_iv_rotator_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/about_me_dating_site_template.pdfIn PDF document text
    • http://refewebol.epizy.com/xelalis.pdfIn PDF document text
    • http://wamovesomawegun.rf.gd/what_are_the_3_levels_of_quality.pdfIn PDF document text
    • http://zeduvekitodili.rf.gd/bode_thomas_by_mohbad.pdfIn PDF document text
    • http://batapijas.myartsonline.com/221b_baker_street_board_game_clues.pdfIn PDF document text
    • http://misanedajog.myartsonline.com/akuntansi_keuangan_lanjutan.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/how_to_program_xfinity_remote_to_toshiba_fire_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/italy_visa_application_form_editable.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_off000103c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 5172 bytes
SHA-256: fd18d475197d1dba8349b4ea857fafab1dcbb7e9f12e6a51aff050e3c10a1713
font_01_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 10360 bytes
SHA-256: 2831246c6a6e817403b8cab3b6ba5fe9d319a7474cce01e612b4e7bbf1f7f77b

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