Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6d7a9e32277dcc…

MALICIOUS

PDF

42.6 KB Created: 2020-04-25 05:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 084874a8d1b77c180f5fb8bd36c88de8 SHA-1: 6b399f91734c2e3119a6abd68446458571c96bff SHA-256: 6a6d7a9e32277dcc900a92faf8395e972da36995ed51c9b6c72ebcd5b56ea28d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files. This suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the structure and link farm heuristic point to a malicious intent to redirect users to potentially harmful content.

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://unicoiwinetrail.com/uploads/1/3/1/4/131437737/131437737.html#sql+server+2016++full
    • http://thelittlefarmonthehill.com/uploads/1/3/0/5/130551777/nozopivujel-davagomunovu-mozef.pdf
    • http://thehitmakermusic.com/uploads/1/3/1/3/131380063/vunimiv-lujuvolizoruroj-wevotedobujegis.pdf
    • http://ayla.us/uploads/1/3/0/4/130489359/676f8e98eaf0.pdf
    • http://stilettosandshotguns.com/uploads/1/3/0/5/130589430/4d5b5817da0ff.pdf
    • http://barndoorgallery.com/uploads/1/3/0/5/130544938/najofuwopol.pdf
    • http://realearlgrey.com/uploads/1/3/0/2/130288549/3fd453ae0.pdf
    • http://juliamirich.com/uploads/1/3/0/8/130813314/7023887.pdf
    • http://andreserpoosh.com/uploads/1/3/1/3/131380183/4445873.pdf
    • http://myvisl.com/uploads/1/3/0/6/130639840/b59774de.pdf
    • http://southerngirlcoffee.com/uploads/1/3/0/7/130740498/6111257.pdf
    • http://psdaily.net/uploads/1/3/1/6/131606434/polubim.pdf
    • http://apexstar.org/uploads/1/3/1/3/131383893/d700d0731383.pdf
    • http://jo-ocean.com/uploads/1/3/0/7/130776088/3cc05fd9508.pdf
    • https://sqlwithmanoj
    • 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_off00007dea.bin
65ff9c494b1ddc24fe12eb652fd44f23b1721d4ebae18b577866ec49f54476d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 8444 bytes

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