Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e7b1df55e4cad0…

MALICIOUS

PDF

68.0 KB Created: 2021-03-01 02:16:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ac4265d7120d2e18071a21a0a5723109 SHA-1: d0607e15ecba0300165fa4144d68fbfdac63e63f SHA-256: 42e7b1df55e4cad0166df3678629886024306a82d7e93b304e523ad68c08c128
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host malicious content. The presence of an external URI pointing to 'vilenefex.ru' further supports this, as it is likely a phishing or malware distribution URL. No scripts were extracted from this sample.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/aws?utm_term=hp+probook+6555b+cmos+battery PDF link annotation
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/8443866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_6028789022a9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5feb7f9160fe1.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/what_can_you_do_with_apple_tv_3rd_generation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_600d87ff33e6f.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/15889191156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_6021956937bce.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/c59818cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5ff52379621bf.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/minabiwa/s_a_ki_full_form.pdfIn PDF document text
    • http://womawujun.atwebpages.com/sobogozo.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/law_enforcement_officers_safety_act_form.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/3d_parallax_background_hd_wallpapers_mod_apk.pdfIn PDF document text
    • http://dodixuvizovov.epizy.com/88971834472.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/madurai_meenakshi_amman_images.pdfIn PDF document text
    • http://juxawewoguseku.epizy.com/modebofagur.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_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 5592 bytes
SHA-256: e86174953c8dcd4e5e1bb896fc36d68ca57c3880855cb8af4b6a0166e5320856
font_01_sfnt_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 11056 bytes
SHA-256: 52c7de4c322760ffee019be95aad8a6cc040f23dd00a1416b043ab5282f143e2

Open this report in the interactive analyzer, or submit your own file for analysis.