Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf4e4d3cc4bc24d…

MALICIOUS

PDF

104.1 KB Created: 2021-02-01 06:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5bd8f2cf32b1e7c4c7e6e8198bad5f54 SHA-1: 359462c0bc2181a123f9c6c9f4657068d72b414e SHA-256: dcf4e4d3cc4bc24d565b51f7962d5e15749b6992fa2f6ba4727ea4121597e2cf
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing to a potential phishing or spam campaign. The embedded URLs, such as maypoin.ru and various weebly.com domains, are likely used to redirect users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=e5-1620+v2+overclock PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5ffbb8b9425e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fd087349276f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5fee99b1a179f.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/nofamuvukijubire.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/701168.pdfIn PDF document text
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/pakuvag_motokizuregoj_tugapagug.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/vipula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fce978034262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ffa15604cd8b.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/efe6e491.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/3747929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ffd1b80307c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600c07b71159c.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/4862416.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000159b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B8 5120 bytes
SHA-256: f4a9e63d925ef03f8bb2c85543c10b8cecc0066a4b7bdda2e83a23cdb89b6fc2
font_01_sfnt_off00016b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5F 11852 bytes
SHA-256: 768d37626cf802f08f21244fa150bb62dde0b6b293328e5c135822220cddef0e

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