Malicious PDF — malware analysis report

Static analysis result for SHA-256 5990e916555cdabc…

MALICIOUS

PDF

37.8 KB Created: 2020-06-17 03:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf011312be57879743b67dec2e6b6ed SHA-1: 81fe4791952c5f0990e62d50de04a3a948e2a865 SHA-256: 5990e916555cdabc1de02cfd6f3b2582a95deb0d8403a779b482c6cfb87883da
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated and contains some of the same URLs, reinforcing the link-farming attack pattern.

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://chickything.com/uploads/1/3/0/6/130603916/130603916.html#waveguide+shorting+plate
    • http://prippa.com/uploads/1/3/0/4/130478975/banikibunidux.pdf
    • http://lojagrande.net/uploads/1/3/1/4/131453051/rovixewamaramer.pdf
    • http://server.oregonadvising.org/uploads/1/3/1/3/131397934/9860660.pdf
    • http://kat2cd.org/uploads/1/3/0/5/130551726/712452c0c2467d.pdf
    • http://msgarletts-hancock.com/uploads/1/3/0/2/130272613/665ffd50e.pdf
    • http://encoreomnimedia.com/uploads/1/3/0/2/130274169/241558.pdf
    • http://autodiscover.shrinershomebrew.com/uploads/1/3/0/7/130776452/37ee19ec67d9.pdf
    • http://jobsight365.com/uploads/1/3/0/5/130588452/mitader-setuzi-sukapamoduji-pewuduwegedaked.pdf
    • http://thistlerose.com.au/uploads/1/3/1/3/131382320/5bef0.pdf
    • http://claytoncollierbrown.com/uploads/1/3/0/7/130776260/zavobojubopa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005775.bin
3696115613e652d5d114c6e15c77c1a32be68a59ed0703412a658f1137b53957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5775 5176 bytes
font_01_sfnt_off00006913.bin
49498b5c0a740ff55ddb3f829af053ba5d589e3f08df937fcebf1abc0afd1ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6913 9936 bytes

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