Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec328bc9be773ac9…

MALICIOUS

PDF

83.5 KB Created: 2021-03-14 03:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 66cab1845f418403bf0a992f33afeca2 SHA-1: 0740b07c621602730a0a7503ab829bf89b678539 SHA-256: ec328bc9be773ac9fe98759a5b9f3082295ee845e4f87ab1a1ca016aeba1df41
186 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 disposable hosting, suggesting a link farm for SEO manipulation or malware distribution. The primary external URI, 'https://golowaki.ru/wix?keyword=bill+nye+motion+worksheet', indicates a lure to a potentially malicious site. ClamAV and ML classifiers confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://golowaki.ru/wix?keyword=bill+nye+motion+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470380/normal_60390dbd31f62.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/misot.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/Ljd1rrJ/rumetom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444115/normal_601fab040fcc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_6007d016b9b8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_600005b42124c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_601a267aa9f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_604143574f7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_6021538823a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b042f065c.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/99feb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_5fdc8955ada5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453890/normal_5fde0de7dea55.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/591f5883.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/gejohir/mekaxorelixukebunitaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_22e2211e17cb4653a19bc344b37cb401.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_d0905d40d84947fa969bc619378eb8c5.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_33e2562f75d74f2d98f90f7dc3f88bfb.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_38b7af15ca4a4ebc8bbd40584c774105.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_d737b26a0f2947c59f3c603d9f6cf1ca.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 4812 bytes
SHA-256: f014e5f369094e707a5834322d81298ad3d48e7e9032dd371fc033b6d4634646
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 11696 bytes
SHA-256: cc1d635331209a1a32890e8144d3ad1ed3e96e95492e2bf28fcef24f0eda213a
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230