Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa3d29b5d4d23b0…

MALICIOUS

PDF

75.4 KB Created: 2021-02-24 21:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: abd52278893c99222e432f87a347ac0f SHA-1: 1ed29af0cbeb17a54cac3c3cf907e759318389c2 SHA-256: ffa3d29b5d4d23b0483846c0b6509e7597b908ddd8e65443eba20d58ce33b994
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, and is flagged as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to 'mrt workbook answers step 5', directing users to external URLs like https://jacksth.ru/wix?keyword=mrt+workbook+answers+step+5. This indicates a phishing or content-scraping attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=mrt+workbook+answers+step+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420230/normal_5fe3beaacab38.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/ffae9223.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/8619498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_60344c8589e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fe0271f13bf6.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/cd2761d9fbfe8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugoxovok.epizy.com/june_21_2019_geometry_regents_answers.pdfIn PDF document text
    • http://kazaxese.epizy.com/b._e_full_form_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/zosawazimanilog.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/77585065470.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/65708274646.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/8276602496.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/buloz.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/extra_long_twin_bed_sheet_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/goodnotes_calendar_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/gpsc_result_2018_marksheet.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/redorepebuzanofegesodod.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5208 bytes
SHA-256: ad33309c8acaa45da4155d07a5d20c99f61789f3c0b7569353452068a23cf539
font_01_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 14748 bytes
SHA-256: b4c9f6257cfaaa0c01addee6f6fb280d89b246e8fa7ca8e93341df0f37f261ee

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