Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7a4a06e350d426…

MALICIOUS

PDF

40.6 KB Created: 2020-06-05 01:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f68199b241386cfaad4bf1875b2ab08 SHA-1: abb489045521300861c6c47a00304bee18222056 SHA-256: ed7a4a06e350d426baf354b1ec713c72c920c48ad9013ffbd1ec47f5daa5c8a6
94 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness. The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO link farming or to redirect users to malicious content. The document body itself appears to be malformed or contains obfuscated text related to the 'Ciclo brayton real ejercicios resuel' title, further suggesting a lure rather than legitimate 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://habaslab.com/uploads/1/3/0/8/130814597/130814597.html#ciclo+brayton+real+ejercicios+resuel
    • http://kd2b.com/uploads/1/3/0/3/130379145/vosoxumogo-zibiwamurodufur.pdf
    • http://badellinger.com/uploads/1/3/1/4/131452861/voxakufofaw_xowenim.pdf
    • http://nadiafarah.com/uploads/1/3/1/8/131856372/jatelilu-fijapi.pdf
    • http://infinitebeauty.nz/uploads/1/3/0/7/130776328/7297b8.pdf
    • http://ichibantobira.com/uploads/1/3/0/7/130740466/xezumanavila-vufijurizadim-limesaputidav.pdf
    • http://warriorweekend.com/uploads/1/3/0/7/130775987/muned.pdf
    • http://smartfuntravel.com/uploads/1/3/0/4/130476732/8e7c67831c842a.pdf
    • http://littypartyinabox.com/uploads/1/3/0/2/130289424/nunegagad-lamoloru-libokewomelusot-xopagezaruzep.pdf
    • http://ashkitomi.net/uploads/1/3/0/6/130605089/rogipopavafirejesom.pdf
    • http://habaslab.com/uploads/1/3/0/8/130814597/terms.html
    • http://habaslab.com/uploads/1/3/0/8/130814597/dmca.html
    • http://habaslab.com/uploads/1/3/0/8/130814597/policy.html
    • https://rozanot.files.wordpress.com/2020/06/dufuf.pdf
    • https://lipurenipagu.files.wordpress.com/2020/06/15845681355.pdf
    • https://lufomewirumi.files.wordpress.com/2020/06/66975053385.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_off00007180.bin
7c623441f37fe26aac2976aed90b7875b6a51237103a5a9bab137ed172a55a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7180 11212 bytes

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