Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79b0e10c5652e16…

MALICIOUS

PDF

75.5 KB Created: 2021-03-13 14:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a32fbb8c182f08c8f0004939e93d94c6 SHA-1: 281dea041991a4acfbdafb5f1e2c8a00f487290d SHA-256: a79b0e10c5652e16878b122ed9ea5c5b04bb74353bdd788d5bd3642103c6a215
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, with a primary external URI pointing to 'https://lozipotod.ru/award?keyword=lawgeex+buyers+guide+pdf'. This URL, combined with the ClamAV detection of 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=lawgeex+buyers+guide+pdf
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/4742020.pdf
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/jasugokomivekubajik.pdf
    • https://cdn-cms.f-static.net/uploads/4384464/normal_600cba88195f6.pdf
    • https://jujavaxoziwes.weebly.com/uploads/1/3/4/1/134108829/jusobuz_gobulogaguber.pdf
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/vemabekadopad.pdf
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fde81112111f.pdf
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff1486d65f1a.pdf
    • https://static.s123-cdn-static.com/uploads/4426972/normal_6003615f2f2d3.pdf
    • https://pokumowudo.weebly.com/uploads/1/3/0/7/130740164/jotul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tanapilamaxi/advantages_and_disadvantages_of_group_technology.pdf
    • https://uploads.strikinglycdn.com/files/9fea2cbc-4128-4c1f-aaac-043932b58159/libro_cosmos_de_carl_sagan_gratis.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/java_8_stream_foreach_vs_map.pdf
    • https://s3.amazonaws.com/zafirawit/bunapimitiwup.pdf
    • https://uploads.strikinglycdn.com/files/5f06e45c-9023-4fb2-8065-6ad8a9eda48a/simple_interest_worksheets.pdf
    • https://s3.amazonaws.com/tojabixefova/bodanivivigafuwa.pdf
    • https://s3.amazonaws.com/xeroguru/zizen.pdf
    • https://s3.amazonaws.com/kotodur/mexetudeserafare.pdf
    • https://s3.amazonaws.com/diwitapezu/10391219626.pdf
    • https://uploads.strikinglycdn.com/files/e7e4eabf-c050-4e26-bb4c-19d90af1542b/fugasuk.pdf
    • https://s3.amazonaws.com/debiwelof/bollywood_movies_2019_hd_site.pdf
    • https://s3.amazonaws.com/fibesezati/oxford_advanced_learner_s_dictionarydrive.pdf
    • https://uploads.strikinglycdn.com/files/2135d1b3-0f0b-4158-9fb4-9f8ba16ceced/45216121626.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_off0000e7a7.bin
2a04a9cbc218e4271f0fcaf647c016548cbaad26124c647e31a67e957f6598a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5520 bytes
font_01_sfnt_off0000fa99.bin
cf7d8b92e311e73129cf6c84414634df1d62bcf695c39dc4f8916a88f9840047
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 11180 bytes