Malicious PDF — malware analysis report

Static analysis result for SHA-256 015676dc9996afe9…

MALICIOUS

PDF

39.9 KB Created: 2020-04-06 07:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 039919a5ee37ef1749e1c5f49ec402c6 SHA-1: 2cc1654eb017571756f67b2fda0dd2eeb8995929 SHA-256: 015676dc9996afe980c0fec34e668f4c0adf3aef6fa82fe6b9148d01853031cb
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" lure further supports a malicious intent. No scripts were extracted, but the sheer volume of suspicious external links suggests a delivery mechanism for further malicious content or a method to artificially inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://photostoriesbyangela.com/uploads/1/3/1/3/131398222/131398222.html#time-saver+standards+for+landscape+architecture+pdf
    • http://tudofeitoamao.com/uploads/1/3/0/7/130775997/e796f.pdf
    • http://nowwhatarizona.com/uploads/1/3/0/6/130604516/tolab-bodema-gugagituvogi.pdf
    • http://amglasswork.com/uploads/1/3/1/4/131408772/afe9cd58c0f9.pdf
    • http://hostmaster.jerseytaxidriversassociation.co/uploads/1/3/0/6/130620820/vezopexexapa.pdf
    • http://peacewithfood.net/uploads/1/3/0/2/130289247/9188896.pdf
    • http://ratificationofthe19thadmendment.com/uploads/1/3/1/1/131164414/4441571.pdf
    • http://fungfound.org/uploads/1/3/1/3/131380470/6223279.pdf
    • http://4mgk.com/uploads/1/3/0/7/130776174/lidixivuzepozux.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_off00007079.bin
9b77344880b3c5245fdcf5a119bccc08568bb5e3e89d5e74f7b62fd1e7823c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7079 9192 bytes

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