Malicious PDF — malware analysis report

Static analysis result for SHA-256 2470fdb81b3818f8…

MALICIOUS

PDF

87.7 KB Created: 2021-02-14 16:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63f01a87dc08e9b1e1bfb1f5a1ee5b73 SHA-1: bb1989d040b59b777354d685bf0b13f01625f7f5 SHA-256: 2470fdb81b3818f86ccfacadf1e522fb3ade59c68e4103a3366ca7ca572e1c9e
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a garbled attempt at presenting itself as a manual, likely to trick users into clicking the embedded links.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/wix?keyword=whirlpool+quiet+partner+i+manual PDF link annotation
    • http://pmaider.com/schma_narratif_de_la_rempaille4tn6c.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/RQicMij/wutipefoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457843/normal_5fcb221b512a5.pdfIn PDF document text
    • http://p-kavkaza.ru/17985351940epm95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_601748d222520.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/zjjjgil/69763102870.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/tevagiwudukawem-sojidefevifelo.pdfIn PDF document text
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/miluwofapunotom-befegejox-ferekogoxogoko-supenedup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fce8a431f2eb.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/rolavabujegarow.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/4193dc4c131d.pdfIn PDF document text
    • http://winnerslm.space/17243665200snhgp.pdfIn PDF document text
    • https://sisajubiji.weebly.com/uploads/1/3/0/9/130969075/a999e3.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_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 5020 bytes
SHA-256: 050421960a7805061503d66e0ec585ab62ec74a383c05b49e1a6cf793aab41d9
font_01_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 11220 bytes
SHA-256: 1d974bb473d9d76f541443802deeb4ce07e6e57f7d156e9319c72700b811e9b1

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