Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca95b9c9922c49b…

MALICIOUS

PDF

84.3 KB Created: 2021-04-25 03:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e6ee0594823648000bc5507f0ac9dbc SHA-1: c52ee8f42ea4186cd586b8788011d647838d5bff SHA-256: cca95b9c9922c49bc096203942dfc0b8fde17615c50683d277932d23b357773b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'jacksth.ru'. The ClamAV detection further supports its classification as malicious, specifically as Pdf.Phishing.Trojan. The presence of embedded URLs and the structure suggest an attempt to direct users to potentially harmful content.

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 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.
  • 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://jacksth.ru/strik?utm_term=casio+g-shock+ga100l-8a PDF link annotation
    • https://cdn.sqhk.co/fugovigul/jVDFKjg/nobariwiwevovotawebefadof.pdfIn PDF document text
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/22596bbd.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/gAwh4id/off_road_rally_car_rc.pdfIn PDF document text
    • https://vavuvulo.weebly.com/uploads/1/3/2/8/132814906/xoveg.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/2808038.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/712ad963-1090-4f65-bc64-381071cdfeff/how_to_do_rational_exponent.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_2f2ee9114a4b425a8da8008171e85b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/wrong_turn_4_full_movie_openload.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_a9924b57537a47c992af3f5344f67fb2.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_52c8c62089864d7f989e057aec26f3c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1493ffd8-078a-40ab-a27c-7322ef7b7acb/how_to_make_a_fleece_knot_blanket_video.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/96156084126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b7c915-454b-4612-ac71-1b7940821341/9191557809.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/mexamafizovesigawo.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/sentencing_guidelines_for_false_imprisonment_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b41445-c56f-4211-b70b-0b26e063d810/how_can_i_terminate_my_rental_agreement.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_d1ab1eef143a4d9b8b497e6f124256a6.pdf?index=trueIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_16fa92e1e9c44b85aaa6175110b1e53f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/los_medios_de_comunicacion_social_en_el_salvador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402f56d3-e935-4c4c-a416-cea2d4e83630/32304926141.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/nomefogodavatojubikod.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/65094934894.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/address_labels_template_avery_8160.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/the_2015_ageing_report_european_economy.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_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 5356 bytes
SHA-256: 6b51ecd773cef233631d3577e611eed113950f4313d59cafc818a2e8e32fa6bb
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 27132 bytes
SHA-256: 70ec63379095d856ce1193dfabba857f0ed1117435c9cd6bdd66ecf31bfee533