Malicious PDF — malware analysis report

Static analysis result for SHA-256 97808f0ca3a6ec53…

MALICIOUS

PDF

85.8 KB Created: 2021-04-04 18:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a3c547613b58b853453ca31587d9bb SHA-1: bf881b53f8d2b8e0dc30bf7a8c19f2398ace5cf3 SHA-256: 97808f0ca3a6ec53397acf9a5c57aea0cfb2a4ad213c7e1ef3e024db45d396db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which are likely part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=dell+latitude+d820+upgrades
    • http://falorilipeb.mywebcommunity.org/que_tipos_de_titulos_de_credito_existen.pdf
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/766090ee7.pdf
    • https://cdn.sqhk.co/bapisolel/f49fEqd/91758655673.pdf
    • https://pitalozel.weebly.com/uploads/1/3/1/3/131384414/musadobowukeva.pdf
    • https://zisaneviz.weebly.com/uploads/1/3/4/3/134319132/4083825.pdf
    • https://zuzatalo.weebly.com/uploads/1/3/4/3/134326893/eec2f95f36f7d.pdf
    • https://cdn.sqhk.co/panajevem/jdijLgj/86416713297.pdf
    • http://nubatevujonuw.mygamesonline.org/58897198509.pdf
    • https://cdn.sqhk.co/vawapisoxe/r8Kkiiy/sapofinivamupavemevimivi.pdf
    • https://cdn.sqhk.co/dubutemaruxu/dcfABic/strategy_pattern_python.pdf
    • http://rulajamizap.getenjoyment.net/2003_lexus_es300_headlight_assembly_removal.pdf
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/sugozafinevi.pdf
    • https://kerijifulonuf.weebly.com/uploads/1/3/5/3/135328136/mazuxoxon.pdf
    • http://bomepufibawil.scienceontheweb.net/marvin_harris_the_rise_of_anthropological_theory.pdf
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/lukogokapa-fiximutexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zidosozawok/bogatuzezo.pdf
    • https://s3.amazonaws.com/lerezazo/journalist_vs_reporter.pdf
    • https://s3.amazonaws.com/farokof/multiplication_with_decimal_points_worksheets.pdf
    • http://jatugeset.atwebpages.com/93837542002.pdf
    • https://s3.amazonaws.com/wixamupelinere/inequalities_word_problems_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011005.bin
83bb4a34b1e1c33e879dfb6950e2973d9a3df13b4652902e9a0dd26aec4bb594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 5596 bytes
font_01_sfnt_off00012321.bin
eb147c66b80dbfa35e6452fa5aed15b5901fffbba9a33719acb152a0fa4c6b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 11532 bytes

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