Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d2a30fd4763145…

MALICIOUS

PDF

39.8 KB Created: 2020-05-24 11:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33db2a19eaeaa77b4838a39154ee4b1c SHA-1: fd323aa8f8e92392d30c9afaf872c58890b0d9b3 SHA-256: e4d2a30fd47631455208b84a687cb075ff7e55c868076716600dcbb4f0f34da5
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 other PDF files hosted on similar domains. The document body, though partially corrupted, suggests a lure related to downloading academic material. This indicates a link-farming or redirection scheme designed to lead users to malicious content. No scripts were extracted, and the primary malicious behavior is the distribution of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jenntreado.com/uploads/1/3/0/8/130873951/130873951.html#introduccion+a+la+biologia+celular+alberts+pdf+descargar
    • http://jwhumbertinc.com/uploads/1/3/0/5/130588762/3857554.pdf
    • http://bluesuede.net/uploads/1/3/1/8/131872000/b0fbbf5900465.pdf
    • http://mightysweets.com/uploads/1/3/0/2/130288549/tinabobafuke_kefaf_jakoxuvutosepux_rovubaxem.pdf
    • http://adamseve.net/uploads/1/3/0/3/130379431/1792992.pdf
    • http://expertresultstraining.com/uploads/1/3/0/7/130739712/66a35a7.pdf
    • http://texasitv.com/uploads/1/3/0/6/130639542/a976584.pdf
    • http://temperamentsart.com/uploads/1/3/0/5/130546971/mopezaxemaba.pdf
    • http://tphltd.org/uploads/1/3/0/8/130874671/devupuboluw.pdf
    • http://isabellasawyer.com/uploads/1/3/1/3/131397981/7640874.pdf
    • http://immobilienmakler-bogenhausen.de/uploads/1/3/1/8/131856492/jumororo.pdf
    • http://74-123-78-171.mgwnet.com/uploads/1/3/1/3/131398575/dudagawafu.pdf
    • http://savingsclub.ca/uploads/1/3/0/2/130289171/cee85959.pdf
    • http://arusticdream.com/uploads/1/3/2/3/132303205/susotaviwugepot_litokiferugapi.pdf
    • http://rylanhenriques.com/uploads/1/3/1/1/131164269/4119137.pdf
    • http://leafandlight.net/uploads/1/3/1/4/131437983/181e35b9f94572.pdf
    • http://hasblady.com/uploads/1/3/0/3/130313108/7504389.pdf
    • http://lifecoachmasters.info/uploads/1/3/0/5/130589410/xuxerudolo_jozut_dotidix.pdf
    • http://steveneparry.com/uploads/1/3/0/9/130969972/4191485.pdf
    • http://stoneedgesharpening.net/uploads/1/3/0/5/130551464/kasom-tolife-xibofev-jopize.pdf
    • http://shyannerain.com/uploads/1/3/0/8/130874642/zijevugizi_fuvupexenilu_dofidoni_gasesomano.pdf
    • http://artisantreasuresonline.com/uploads/1/3/0/4/130477882/9adf8c74498.pdf
    • http://naturalrawgoodness.com/uploads/1/3/0/8/130874086/bb27c40b0a3d32e.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_off00006b80.bin
bd3e6b5ff6d190e336e09edd23576374a1629fb8bbb2767d887ce80731ef0656
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B80 11440 bytes