Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0210e109759f62…

MALICIOUS

PDF

81.8 KB Created: 2021-05-15 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7104ba596aa76f539557dc0fbec7ccd7 SHA-1: 2987f5e883558a150d3e16e0bd7f1599996790ec SHA-256: ca0210e109759f6234350c5639720743fa1d130bda05ce054d9b8b63887cb9fa
186 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. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of URLs like 'https://pelibifir.ru/strik?utm_term=how+to+use+exercise+rubber+bands' points towards a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+use+exercise+rubber+bands PDF link annotation
    • http://wedipum.mygamesonline.org/the_law_of_the_garbage_truck_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_5ff149492fe2a.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/99124783293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_60638e09d45c9.pdfIn PDF document text
    • http://lozutapezu.iblogger.org/present_perfect_continuous_questions_and_answers_exercises.pdfIn PDF document text
    • http://reduslim-ordina.site/cults_primary_school_inspection_report2z7tp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_604fe0b11cb7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_5fe696e0a7aa6.pdfIn PDF document text
    • http://lukumafuzot.iblogger.org/cultivo_de_cebolla_china.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_601417b9aadff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fd2e5739f57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_60542fbd949f0.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/43181016168.pdfIn PDF document text
    • http://atlas-copco.su/chapter_4_aplia_homework_answerslun6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_6009a35abbb76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogomore.myartsonline.com/jixagogusokusowep.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_1cddce62c3b74ca691a0be16c260de3b.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_c7f3b1dc61b74035a627a4212c49e895.pdf?index=trueIn PDF document text
    • http://posamesesul.epizy.com/fodojugozodewazize.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_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 5164 bytes
SHA-256: c2ffb6077dfd1091e43842dbb61b3d9f4708e2cc24ff1261b6ad6f3ef87a672a
font_01_sfnt_off00011659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 10564 bytes
SHA-256: 16511d416c395a8c2cb9a64487a438c1a08b6fd3efbc47186d81462190fe6963

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