Malicious PDF — malware analysis report

Static analysis result for SHA-256 658e38913969669e…

MALICIOUS

PDF

76.7 KB Created: 2021-05-24 07:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c72013b8074fae8beb77c6a45e89855a SHA-1: e16c1b731d3139063e281946850345e328a95d63 SHA-256: 658e38913969669e1d34f9e358d8403c7a69c6cdd3536434c03f27ba911f6a16
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is mezovuduw.ru, which is likely used for phishing or distributing further malware. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://mezovuduw.ru/strik?utm_term=star+life+cycle+worksheet PDF link annotation
    • https://sorajofuwomukiz.weebly.com/uploads/1/3/1/4/131407138/e669276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_60244e884e6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601cb1fb7033f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6055329c5dae5.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/32c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_603630589be06.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/rijemofus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/tapepolofir.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/android_api_level_28_name.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/vegetarian_lasagna_no_pasta_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/parirega.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/mopijowiguwus.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/kulegimiwuvuva.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/does_wd_my_passport_ultra_work_with_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/acrimonious_adjective_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/crystal_report_tutorial_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/the_chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_full_movie_download_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/womosotemifuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/sefilukasakovanu.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/binh_php_tn_t_v_36_mu_k_tp_13.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/46117803435.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/2782648595.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/wepasosabomonalutusoxaje.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/how_to_soft_reset_galaxy_a10e.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_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 5332 bytes
SHA-256: 59a0a49245890a3791a2d6c9e813e19240fcfdae922156edc31747cc77d1915f
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10324 bytes
SHA-256: 5084b0937ff7a51e3b58b3d46184dbaa4dc51cfc640832f9ff56da2724b2f5b2

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