Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a8181aa1f3142d…

MALICIOUS

PDF

87.1 KB Created: 2021-02-12 16:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff35e1ebf9cd120a846400c4a9c1d2a8 SHA-1: c3d78a31fb24d79d7233d49cf5d9262d301f4ad9 SHA-256: 11a8181aa1f3142dfbfed748696de8a8a0071774f9268737383aebc4d8b57791
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://baarspo.ru/123?utm_term=self+spanking+assignment', is identified as a redirector for free-download phishing. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to an assignment, reinforcing the lure.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=self+spanking+assignment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5fcf88fe9bb48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5feafef5bbf95.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/rajafo.pdfIn PDF document text
    • http://alisabor.design/31428335811griop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff48d6228ab0.pdfIn PDF document text
    • http://gawuguvososu.iblogger.org/sexedatigesus.pdfIn PDF document text
    • http://love-cosmetics.shop/simple_infographic_template_word56rsq.pdfIn PDF document text
    • http://sobakin.space/99588423692ix4l4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60127f6c8fcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_600c7c17eb030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446168/normal_6006335d12103.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/2174503.pdfIn PDF document text
    • http://creditscorefix.info/sexudegomegoximajei6vuj.pdfIn PDF document text
    • http://rojorose.iblogger.org/67817730592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5ffb25fb2f9cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegaregajisojas.rf.gd/zirufuzimo.pdfIn PDF document text
    • http://jofesowevelen.epizy.com/cpe_tracker_spreadsheet.pdfIn PDF document text
    • http://zorijofoxafa.epizy.com/39336909446.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_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 5292 bytes
SHA-256: 2b7b69283d87d24948c37b1f2eccf2cbab5739483ccf46f7842652081b785c43
font_01_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 10884 bytes
SHA-256: 07023da38cd9d9408b4e6fc3f4271792add1d40922b833dfe466370ca83e4d48

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