Malicious PDF — malware analysis report

Static analysis result for SHA-256 a152d7ec54b8edea…

MALICIOUS

PDF

78.8 KB Created: 2021-04-08 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 99f352637686b996f5620cc3defb6bed SHA-1: cbb149e323f82bd20d957636594f7db23d5b67bc SHA-256: a152d7ec54b8edea3f27e173122edba090df1d417ed148d77fe9ab913bfcdcf4
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=way+to+go+child+support+card+number PDF link annotation
    • http://sezituza.66ghz.com/2013_jeep_grand_cherokee_laredo_x.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/idicHjh/xunes.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ieF0O9H/nutarifimazetutagodo.pdfIn PDF document text
    • https://setejurisu.weebly.com/uploads/1/3/2/7/132740540/bonolukofejir-popewulupiw-kubidudipawo.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/BjjNyvW/16333515479.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/miribesud_lugoni.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/mujofutiworavirago.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/OnwqKgg/gigabit_off_road_1._22_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/ePPUvC2/microsoft_office_sharepoint_designer_2016_download.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/editing_to_word_document.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/virology_book_free_download.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/cardiac_arrest_algorithm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulepafifakixik.epizy.com/lights_out_2016_movie.pdfIn PDF document text
    • http://soxomipimumoraz.rf.gd/60975997297.pdfIn PDF document text
    • http://pazatirademe.rf.gd/safimifuwatisupojezoro.pdfIn PDF document text
    • https://7fc064a1-7d03-4d1b-8e05-e20e0f6acf4e.filesusr.com/ugd/f64db8_b9bef66530f24bbabf0a9066f1fc933d.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_4b6e4f57338e4ec5a2f3ca20190de8eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a44b9f-1ffd-4c43-943c-26b938c1e5ab/how_to_light_pilot_light_on_ge_spectra_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fb1c23-f6df-4fcf-b7ca-df3a949daab3/how_to_answer_critical_thinking_questions_in_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d786f2-069f-4974-84ab-d1a2a1a68232/maytag_bravos_gas_dryer_not_heating_up.pdfIn PDF document text
    • http://jemileti.atwebpages.com/boorman_s_pathology_of_the_rat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857a74c8-dc19-46c5-8147-aefd93e91d53/69926350503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0ec375-bed4-4300-b4d0-251cf816f6f2/42836025851.pdfIn PDF document text
    • http://kurorasi.rf.gd/booty_band_workout.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_ff4e54ecb702411383a76648fb45b34d.pdf?index=trueIn 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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5744 bytes
SHA-256: 63036c0b606dd6af23dc30beccc52a53ff7618fa1b713800859747317e985b7d
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 10688 bytes
SHA-256: cb66cd8da56dbf5f479b45d04e3d3cf4b86c9ae7da6cbdbd5076f43b8d7d667f