Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e29c7b0b73ebfcf…

MALICIOUS

PDF

79.6 KB Created: 2021-05-30 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c5adbe23e554d26162a1af7ca3ade6b7 SHA-1: c8e9879121b68fba644bcd2853967d2b322caaee SHA-256: 8e29c7b0b73ebfcf612fa3ab32a8c681461d1783b9f2faafabefd64462856443
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF document contains a lure for downloading "Avast driver updater registration key free download", which is a common social engineering tactic to trick users into installing malicious software or extensions. The document also contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/strik?utm_term=avast+driver+updater+registration+key+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5fc7107c4e9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fd1268a8f2fb.pdfIn PDF document text
    • https://tuwureliw.weebly.com/uploads/1/3/4/1/134108737/senejaxi_xitiraner.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/0b85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_602060fe68ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_60203cafae4a4.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/mabon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_604386593f6f5.pdfIn PDF document text
    • https://poxaneduwi.weebly.com/uploads/1/3/4/2/134234601/patev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fdc0890510fd.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/82259878f448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5fea11b50a549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_602ff920480e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473023/normal_60498bc51608a.pdfIn PDF document text
    • https://zevikevugibemu.weebly.com/uploads/1/3/2/7/132741211/wibube.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/f22df36f-dd37-4cbb-9b11-6db85f4084cd/marlin_336c_35_caliber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb6e207-6325-444c-99a6-a6e70cc18ea7/singer_sewing_machine_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b836fe-8694-4c27-8e9d-447870459a2d/32994941300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd16153-3a50-4234-ae57-f67b3cf08225/brother_xr-65t_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42aa6776-bfdb-4d1c-82ba-4c042beb6adf/tesoxisaxexutujemije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89065f7-0a69-4ebc-a1ce-a5a4bbc31aff/52942263118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a70e52f-bce7-4fb8-8513-f252b33e7582/6244629961.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_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 5516 bytes
SHA-256: 404319b45632a8c088bfc281293df4c7daa0826c1244742aa7b5d173ea01bfc5
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10388 bytes
SHA-256: 520c280df994c90ed1b3c184a3c861c2c6c2467466b5750c7624a11720d8849c

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