Malicious PDF — malware analysis report

Static analysis result for SHA-256 69742b9fc62bdc94…

MALICIOUS

PDF

87.0 KB Created: 2021-03-19 11:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 709e6d8579be857e91bcf89c1e7651b6 SHA-1: 6f20ef3ee0d2e5472552537abede69d94f0d1c03 SHA-256: 69742b9fc62bdc94c4bf4c39ed78aad271c9e13b2471f486558d980a9559c693
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate link traversal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/award?keyword=cfa+level+2+study+plan+pdf PDF link annotation
    • https://cdn.sqhk.co/jigixomavola/fjjjbgg/zeranokujotameno.pdfIn PDF document text
    • http://lodixol.22web.org/ielts_listening_practice_test_academic_with_answers.pdfIn PDF document text
    • http://ximamigi.iblogger.org/apply_yourself_to_reading_and_writing_brochure.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/ggcYij3/lego_marvel_super_heroes.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/wikuzoturotitan_wanofome.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/R0TtuF2/248184639.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/bikuxawilogikumawemibo.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/c3wieXO/mifavoviwajazorajapewijev.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/8agciaS/jaxumirukebev.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/subaxofamekimu.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/vgcidhi/level_of_measurement_pop_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/3q5ibmR/9668278654.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/UiMGij6/skype_vs_hangouts_2020.pdfIn PDF document text
    • https://manasuxejorodi.weebly.com/uploads/1/3/1/6/131606962/zedevidiso_xojapigavi_leladikitowipix.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/a_christmas_carol_radio_play.pdfIn PDF document text
    • https://cdn.sqhk.co/fufafetuno/ja0FMja/68417309826.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/what_words_should_not_be_capitalized_in_a_title_mla.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/gne_arpmas_tedavisi.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/candle_in_the_wind_piano_solo.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/zaronirusubami.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajaduluf.epizy.com/90238184771.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/30676291911.pdfIn PDF document text
    • http://pofulexurukuka.rf.gd/12061829791.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/mossberg_930_spx.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_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 5140 bytes
SHA-256: 4d0b8bb7c206043d36852c9422aff30ca84f86edec03218591b38746625bb107
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 11468 bytes
SHA-256: c939e9a51b2eb1c480af610191c5be24981cd862db4ac901a56e43bbb89c48e9