Malicious PDF — malware analysis report

Static analysis result for SHA-256 d662ead16c19a877…

MALICIOUS

PDF

42.4 KB Created: 2020-06-19 00:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3707f31dc95217774cca30356dbef33d SHA-1: f348fa6601c0a4a11ad3df609a6b4d629df2c60c SHA-256: d662ead16c19a8772d61aa54bc8b75c9bff04528d80ad2bd773badeae4b780ac
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body itself appears to be a lure related to 'sustainable drainage systems', but the primary malicious activity is the extensive link farm pointing to various PDF files on different domains.

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://sfsecure.com/uploads/1/3/0/8/130813490/130813490.html#sustainable+drainage+systems+a+guide+for+developers
    • http://jtbsinc.com/uploads/1/3/0/6/130605244/gudejajotowij.pdf
    • http://ervingfamilyreunionevents.com/uploads/1/3/1/4/131408168/7092404.pdf
    • http://autismbehaviordevelopment.com/uploads/1/3/0/5/130550675/ae2ec6add.pdf
    • http://in-broiderycreationsllc.net/uploads/1/3/1/3/131379700/fogegufodim.pdf
    • http://fatherofsafety.com/uploads/1/3/0/4/130435833/dijifo_bawofalutujozaw.pdf
    • http://mail.fatherjim.com/uploads/1/3/0/8/130874629/50f821448a331c.pdf
    • http://craftyourvoice.com/uploads/1/3/1/3/131384484/3300333.pdf
    • http://microfiberexpress.com/uploads/1/3/0/7/130739532/rosenaju.pdf
    • http://katielatham.com/uploads/1/3/0/4/130476818/333465.pdf
    • http://possibilitiesmarine.com/uploads/1/3/0/4/130483510/6800471.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_off00006911.bin
9246bbcb22bfdf403384ab80e27af43b363a969e3c5be57e77eefcd622372356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6911 5648 bytes
font_01_sfnt_off00007c25.bin
b1600537f0606fdca5466dc2a797f3ab26eb06f2deeac70bba61c12af066e8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C25 9592 bytes

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