Malicious PDF — malware analysis report

Static analysis result for SHA-256 e883a6efa1228210…

MALICIOUS

PDF

40.4 KB Created: 2020-06-10 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d2006509102540c71e0ee529338c27 SHA-1: 1f0119dbaff2361c7f298df873f2823580bcf3db SHA-256: e883a6efa1228210eea41e1a778ad40954841e2a0148885cc7d8fa73eaef5df4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the URLs, suggesting a lure to external content. The primary attack pattern appears to be directing users to a link farm, potentially for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://stonesoupgarden.org/uploads/1/3/0/7/130739198/130739198.html#cavalier+K%25C3%25B6nig+charles+cocker+spanie
    • http://fire-ice-designs.com/uploads/1/3/0/7/130739202/vufirejavenenilovoz.pdf
    • http://2325maurystreet.com/uploads/1/3/1/8/131871408/1608f0e.pdf
    • http://carpetcleaningfw.com/uploads/1/3/0/7/130739275/vexerobixa-lufosa.pdf
    • http://embracelifetoday.net/uploads/1/3/0/6/130639306/db5a389e98ab00.pdf
    • http://vhobezoekers.com/uploads/1/3/0/7/130776298/c57a741f5d3.pdf
    • http://gotkeystudio.com/uploads/1/3/0/2/130289235/kizafaweso.pdf
    • http://domvicsam1.net/uploads/1/3/0/5/130539341/pilodivola-dakodusovuvid-jobigidalojozev.pdf
    • http://mta-sts.mx.thesoftersideofdance.com/uploads/1/3/0/6/130620605/8323764.pdf
    • http://mail.bibliovista.com/uploads/1/3/0/4/130483248/torunapov.pdf
    • http://living-twenty.com/uploads/1/3/0/3/130313319/4849509.pdf
    • https://befutawoz.files.wordpress.com/2020/06/82211040782.pdf
    • https://tolefeguxi.files.wordpress.com/2020/06/55749052207.pdf
    • https://wufabok.files.wordpress.com/2020/06/guvoxujotijizo.pdf
    • https://wofopisuf.files.wordpress.com/2020/06/73373824122.pdf
    • https://gofiteturape494264367.files.wordpress.com/2020/06/46491559329.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006839.bin
624e94be47551a829097b0cb392aad919be2011f2a6579451b57262fa264f2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 14332 bytes

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