Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7cbe69412abcff…

MALICIOUS

PDF

33.7 KB Created: 2020-06-03 20:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20dae3aed983a1b07001025c5a6dadbc SHA-1: 9bfa8247916b3169fa0376930b2c3e1a6a0059df SHA-256: 7f7cbe69412abcff9a69b8e577af7f4a20a169e18395f6dbc5df2de952e09b71
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains structured for SEO manipulation, suggesting a link farm or content-luring tactic. The document body, though partially corrupted, includes text related to 'AWS certified developer' and 'guide free download', reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs indicates a likely attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://fs13kl.bdgct.com/uploads/1/3/0/6/130620430/130620430.html#aws+certified+developer+-+associate+guide+free+download
    • http://velocityerp.us/uploads/1/3/1/3/131380531/vobinut.pdf
    • http://thebeeskneesllc.com/uploads/1/3/0/6/130639884/2140715.pdf
    • http://ontariomagicians.com/uploads/1/3/1/4/131452840/sewafupewas.pdf
    • http://ashermainecoonkitten.com/uploads/1/3/1/4/131453539/furavebitogod.pdf
    • http://kevinpistole.com/uploads/1/3/0/6/130620563/9665059.pdf
    • http://cfoondemandcr.com/uploads/1/3/0/9/130969355/7137723.pdf
    • http://thehybridacademy.com/uploads/1/3/0/3/130323998/4324329.pdf
    • http://fs13kl.bdgct.com/uploads/1/3/0/6/130620430/terms.html
    • http://fs13kl.bdgct.com/uploads/1/3/0/6/130620430/dmca.html
    • http://fs13kl.bdgct.com/uploads/1/3/0/6/130620430/policy.html
    • http://fs13kl.bdgct.com/uploads/1/3/0/6/130620
    • https://nerilofu.files.wordpress.com/2020/05/bunofepopex.pdf
    • https://suxeniruwip.files.wordpress.com/2020/05/beratijeleg.pdf
    • https://wikanoxegi.files.wordpress.com/2020/05/zejipexajowoxupubag.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_off0000590f.bin
1d4f2f860c30eab1f88e27af3ed796d076c1cfaac837eafd87179588eff013b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590F 10100 bytes

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