Malicious PDF — malware analysis report

Static analysis result for SHA-256 882377ab67345515…

MALICIOUS

PDF

85.0 KB Created: 2021-04-07 23:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61927e030237c9866d5f0375a6ab0ebb SHA-1: 07fc9ed0be5ccf672701ba2f4c3c66624618b930 SHA-256: 882377ab67345515ccb7601d76d9d4543533388e5c7dbf26e81b1e36e6fe513c
196 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to improve SEO for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=adelaide+crows+former+players PDF link annotation
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/pukodewameximuwunune.pdfIn PDF document text
    • https://cdn.sqhk.co/lojewewure/jbbRGoc/25677562377.pdfIn PDF document text
    • https://gasovopur.weebly.com/uploads/1/3/1/4/131453365/5288256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_600b12c8c0f38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5ff3c155b5403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe48d13c8f98.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/7gfjhgz/14227281910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5ff2a066e7e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6041f250db4cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5fee4531f3de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_602febb4459b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_605fbbfa4012c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5ff527ec5ddfa.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/cjdjfjb/realme_lock_screen_password_reset.pdfIn PDF document text
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/1347726.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/rerego.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/varepija.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/revitakulizagi.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://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_d00ae6416c864c288d5c2c333d5f12d3.pdf?index=trueIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_ae76cc3863f24fd7972d96d76eb6bed5.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_40e157531b9b49ff80a4d975f50dd6f6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 5084 bytes
SHA-256: b534ea0ae9590df5e59dfe6855939271141a7ca32d654cfc95b1e2eb6339729b
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 11148 bytes
SHA-256: 0cdacd7e5f2500e5ba14a3444b73f54c2c8d1ade0c3ceadb310049ac361c790a
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16328 bytes
SHA-256: 78493034c033d0861782d53997b784eeb14f7cecaab48b0f43681cd7da4d5e88
font_03_sfnt_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230