Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f19bbaa45573d…

MALICIOUS

PDF

76.0 KB Created: 2021-06-04 23:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fdcd51614f88080534f14bf0bd469809 SHA-1: 450a82c6f6041db9d1357697e9a7610e509d8996 SHA-256: a48f19bbaa45573da5f5d4197540a1b19ae4a142a6099206baf39c80ff29f5de
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary URL, 'https://pistant.ru/pbw?utm_term=tricky+core+java+interview+questions+and+answers+for+experienced+pdf', appears to be a lure for potentially sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pistant.ru/pbw?utm_term=tricky+core+java+interview+questions+and+answers+for+experienced+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498330/normal_605f6558f4212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5ff7649f8674f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_6055b6f30e2b5.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/kefomi-vavirokar-tojer-xagulex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_60611a24f1240.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/kefirizigalokuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_60641d35643e3.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/jabejaduwagu_ketupozav.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/votika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5fc9e946c82f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_6023dffd173fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_604fa1c39cfd0.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/97e244d4-0ef0-436e-ba50-3c685a4741a6/21564764073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7abd41-3eb6-4634-bbe9-2b5aa93e1176/febofasaxadofofelegoj.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144496170/gmod_download_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d525db-9c32-4f07-8cb0-e2eecb754746/doboso.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/hollister_guys_size_guide.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144623382/donexud.pdfIn PDF document text
    • http://pitevaj.pbworks.com/f/verexugafevibamekerik.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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 5656 bytes
SHA-256: 90ae4830fe5aa6b1e0797783f087b21e6e041d0a6167412650ef61216103142c
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10760 bytes
SHA-256: 75de689c8ee601077785f25a9279ee8f60f1e5643d8bfaa1c68e4fb19f2550a4

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