Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f02a5c7319b226…

MALICIOUS

PDF

48.6 KB Created: 2020-03-11 10:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36c58c88341836153ac9bcc60a6235fb SHA-1: 7b5c073fa325a112ffa80251910ec186e790d470 SHA-256: 32f02a5c7319b2263bab5b0d6bda017fce5b83472ff1b7a61dbe589a4c01782a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though malformed, contains text related to 'conceptual framework meaning pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent of the link farm.

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://sequoia77.pleasingfood.com/uploads/1/3/0/6/130620454/130620454.html#conceptual+framework+meaning+pdf
    • http://davidpgeorgi.com/uploads/1/3/0/2/130270921/9650295.pdf
    • http://webmail.callbuddys.com/uploads/1/3/0/9/130968973/71a6007376b.pdf
    • http://emmadevereux.com/uploads/1/3/0/5/130548108/197382.pdf
    • http://mygranitestore.com/uploads/1/3/0/4/130488626/zasivesovaseborat.pdf
    • http://aspiringwindowfashions.com/uploads/1/3/0/5/130551160/gapumubujav.pdf
    • http://casadelbuentratohovde.org/uploads/1/3/0/3/130323547/b60882f5d0121.pdf
    • http://mail2.vishweshdesai.com/uploads/1/3/0/9/130969981/9594e9cd9a40b7.pdf
    • http://radikal4kidzinc.org/uploads/1/3/0/2/130287488/7231582.pdf
    • http://makerespect.org/uploads/1/3/0/4/130476273/linefenusixus-volunegivute-bizovugo-bodemudemam.pdf
    • http://weddingness.com/uploads/1/3/0/7/130740046/6833327.pdf
    • http://mawilabs.com/uploads/1/3/0/6/130620159/5f36b198e.pdf
    • http://suspectedspam.com/uploads/1/3/0/9/130969887/fekewaxatezuwotamoro.pdf
    • http://www.bookclubs4kids.com/uploads/1/3/0/5/130588716/9017824.pdf
    • http://www.gcsouthstarllc.com/uploads/1/3/0/2/130274017/tutoxu.pdf
    • http://chrisfaraji.com/uploads/1/3/0/6/130605383/wusurifaxes.pdf
    • http://www.shopkayandjay.com/uploads/1/3/0/6/130605254/zijiwebufed.pdf
    • http://mijnheerdegroot.nl/uploads/1/3/0/8/130814286/jubinis_tawabupodep_bamutosibix_luziteveset.pdf
    • http://www.drvalter.com/uploads/1/3/0/6/130621702/sivope-dugotij-vazojimabilapo-bifekazuwazumur.pdf
    • http://www.w300ak.com/uploads/1/3/0/4/130477633/6850376.pdf
    • http://mail.barnhartsfeedandseed.com/uploads/1/3/1/0/131070583/53f42ff645.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_off00007ebc.bin
492eaffa1d252440b21263eaff3e1dbab131c1eac5bb47c11d1f964766e7e765
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBC 7912 bytes
font_01_sfnt_off00009d4f.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4F 16204 bytes