Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd30a96793ace191…

MALICIOUS

PDF

42.6 KB Created: 2020-03-12 02:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb7d8ebd8cd5fda8c35de558e0a85d97 SHA-1: 4a6e0c0683db5c207a98289f8b6f9a4b413951af SHA-256: cd30a96793ace191df7ccd7bec7759be95b50b5a764f4c345566b4136cb15ac3
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of links suggests a delivery mechanism for further compromise.

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://bposrv7.benefitplans.org/uploads/1/3/0/2/130273845/130273845.html#abraham+flexner+the+usefulness+of+useless+knowledge+pdf
    • http://lindaherrera.com/uploads/1/3/0/7/130740142/659177.pdf
    • http://mycalirado.com/uploads/1/3/0/5/130588624/tizutatedewowav.pdf
    • http://casinotestbericht.com/uploads/1/3/0/5/130589433/siguvuw_munifilonopew.pdf
    • http://simonwestlake.com/uploads/1/3/0/6/130604803/2f6b3e.pdf
    • http://sanfordandsonpropertyinvestments.com/uploads/1/3/0/7/130740116/ceecdf5.pdf
    • http://eleanorannsentiments.com/uploads/1/3/0/5/130588787/2135682.pdf
    • http://crosbyirontonmusic.org/uploads/1/3/0/2/130274316/lebixoza-wavedo-tawexu-xexave.pdf
    • http://leslieslasagna.com/uploads/1/3/0/5/130589281/3682344.pdf
    • http://winlifenow.com/uploads/1/3/0/5/130541137/731432.pdf
    • http://diasinstalacoes.com/uploads/1/3/0/6/130639337/6d122174d.pdf
    • http://bnaturalsbodyproducts.com/uploads/1/3/0/5/130541688/79c18306f42d.pdf
    • http://theyarn.shop/uploads/1/3/0/7/130739893/2634807.pdf
    • http://designer-inc.com/uploads/1/3/0/6/130639889/zepekodaligiz.pdf
    • http://capaco.be/uploads/1/3/0/9/130969950/3168732.pdf
    • http://patboyd2016.com/uploads/1/3/0/6/130605416/dawud.pdf
    • http://www.teamthomason.net/uploads/1/3/0/3/130379075/8364963.pdf
    • http://barnwoodlodge.com/uploads/1/3/0/5/130550910/fizepovekuvi-nimebi-dogizapose.pdf
    • http://impactpowwow.com/uploads/1/3/0/4/130488955/6299445.pdf
    • http://atxtowing.com/uploads/1/3/0/3/130313075/7534bf0a048.pdf
    • http://www.theyellowmustardseed.com/uploads/1/3/0/3/130312986/3564305.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_off00007b8f.bin
d8af11a3de028caa5735825c3b3e3463cf0b35fc305741622a8f8bb7df0bbcf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8F 8652 bytes

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