Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bebfbc918eddf1c…

MALICIOUS

PDF

55.2 KB Created: 2020-04-10 08:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f873f34a3cb32ee6c55233643d99369 SHA-1: 429b4b43b76df11a766b5f4bf921be2e9e242d31 SHA-256: 9bebfbc918eddf1ce1f7c55c920c4c29ba49ff4c6db681e04b23662dc4bef893
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains. The document body text, while appearing to be a question about the molecular mass of zinc, is likely a lure to encourage users to click on the embedded malicious links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://darkskyislands.net/uploads/1/3/0/3/130379357/130379357.html#qual+a+massa+molecular+do+zinco
    • http://tedaspain.com/uploads/1/3/0/6/130604798/lobopi-mojopej-kotewuregut.pdf
    • http://48sandwiches.com/uploads/1/3/0/4/130483736/5960206.pdf
    • http://chrisnoldenmedia.com/uploads/1/3/1/3/131383630/potifi.pdf
    • http://ashworker.com/uploads/1/3/1/4/131438510/a9a8079dc01f.pdf
    • http://fredjack.com/uploads/1/3/0/3/130379959/1897253.pdf
    • http://moreaction.co/uploads/1/3/0/7/130738933/lazulegitobevamodoju.pdf
    • http://torontopilipinosdachurch.org/uploads/1/3/0/3/130313167/3776344.pdf
    • http://aroproperty.com/uploads/1/3/0/7/130738559/tifadopoz-zogagelamat-dujati-tezasodobutafos.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_off00009b38.bin
91b676eb37d206e159fff2cb0b47eace13d6f6999670cdb9b4685a7614bb729a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B38 11964 bytes
font_01_sfnt_off0000c1fd.bin
9de97c3f0d9f161f05e61f78001ce6677ca6a96dfe26e3b33fc238d2b2c658b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 3600 bytes

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