Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ee12b208747427…

MALICIOUS

PDF

73.4 KB Created: 2021-05-14 19:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 228fe2500002108994723af1d60b9982 SHA-1: 575e2a88934dd8fece37ce394d8d9d962aefbea2 SHA-256: 23ee12b20874742753a622aa104a90498602ce582feab432bcbb09edf2062546
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=ez+go+workhorse+st350+parts+manual In PDF document text
    • http://kirakexig.mypressonline.com/in_the_heights.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/pinel_biopsychology_free.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/hampton_bay_ceiling_fan_remote_uc7083t_not_working.pdfIn PDF document text
    • http://prequester.online/18874575434mgodj.pdfIn PDF document text
    • http://ita-fitness.fun/appraisal_form_filling_software_testerohzwq.pdfIn PDF document text
    • http://probmaka.tech/wibajaddyj.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/pronunciation_exercises_vowels.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/air_force_one_movie_online_tamil.pdfIn PDF document text
    • http://verification-help.com/85843011230kr02h.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/7730889895.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/arm_exercises_with_resistance_band.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/biochemical_test_for_bacterial_identification.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/elektrik_arpmasnda_ilk_yardm.pdfIn PDF document text
    • http://tehnikator.ru/gevodasaliy0k1r.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/analisi_logica_scuola_primaria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0b25f4-851b-46ae-87c9-f3e93064ad38/bibifeserosizewafotaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/bwi_airport_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2617b205-0ae4-46c8-ac68-a2d2ebf0eab7/wogepunixiwowozafugine.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/95695279996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5b430c-2bef-4a92-9074-c9f0db1303fb/function_transformations_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cae1d72-a13e-4202-a0f2-12ad7abe3acc/star_wars_age_of_republic_heroes_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/management_of_hypertension_guidelines_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a23937-506b-4672-a7ff-7d5ebc0256f4/huffy_hardtail_mountain_bike_20_inch.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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 5828 bytes
SHA-256: 5fa39927912e5f87c482a225dfa0e18f68be7a536f90145952c40dbf2d3fb7d4
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 11904 bytes
SHA-256: ff143dd7b1b914ac0809ada6629e12f73a2a3d5440deec956cdb4700b3987c91