Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9120b2e5e8fd3a…

MALICIOUS

PDF

37.9 KB Created: 2020-04-30 19:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d46652b3cb45fb56c36061164ebad0cd SHA-1: f9a680d2ca5cb5ca9e38ab14294b32a4f0611d32 SHA-256: 0a9120b2e5e8fd3aa1f428957b125bc41d337b85a88171a177cd49b814388512
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified as a link farm, pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute further malicious content via these links. No scripts were extracted, but the sheer volume of external links is highly suspicious.

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://mightypharaoh.com/uploads/1/3/1/3/131379567/131379567.html#adulteration+of+food+project+pdf
    • http://skiappartement-saintgervais.com/uploads/1/3/0/6/130620501/ditijij-xosekowaneb-lateki.pdf
    • http://sowerhk.com/uploads/1/3/0/6/130620853/rizaduxolel_lodugavinozoged.pdf
    • http://mbkdallas.org/uploads/1/3/0/9/130969341/8720731.pdf
    • http://itivinesausal.com/uploads/1/3/0/8/130874127/8001877.pdf
    • http://southcentralmarketinc.com/uploads/1/3/0/4/130477310/1188158.pdf
    • http://tudorhumphries.com/uploads/1/3/0/6/130620198/dopitu_tekozimaxoma_lezamib.pdf
    • http://sci-mathschool.com/uploads/1/3/1/6/131606940/lugitejam_likevod.pdf
    • http://clikresume.com/uploads/1/3/0/5/130588512/nipufi.pdf
    • http://chevroletcamaro69.com/uploads/1/3/0/2/130288552/malapupib.pdf
    • http://catiejoy.com/uploads/1/3/0/7/130739011/beb4865c799349.pdf
    • http://mullinslawncarelandscape.com/uploads/1/3/1/4/131454620/fiwer.pdf
    • http://skipandgive.org/uploads/1/3/0/8/130874073/getanesezazu.pdf
    • http://livingthedreammortgagefree.com/uploads/1/3/0/3/130324236/4f910.pdf
    • http://gyrocity.net/uploads/1/3/1/4/131406104/rizozijakijumol.pdf
    • http://antipodean.co/uploads/1/3/0/6/130604169/5678323.pdf
    • http://toronga.com/uploads/1/3/0/8/130874573/buxudo-pilumejenovo-nutumuzasafa.pdf
    • http://pearlmusic.org/uploads/1/3/0/3/130323251/riwopojitar.pdf
    • http://webstervip.com/uploads/1/3/1/4/131454634/bukalorifaxomo_xotubuwa.pdf
    • http://danielcummins.com/uploads/1/3/0/7/130775583/fewatogibare_pigika_tagidoxiwu_gifebek.pdf
    • http://lauraprietovelasco.com/uploads/1/3/0/7/130739860/soworodilufalit.pdf
    • http://mybabyluvz.com/uploads/1/3/0/7/130775747/6869069.pdf
    • http://athaliahrenee.com/uploads/1/3/1/6/131606508/251322.pdf
    • http://shmactopus.com/uploads/1/3/0/6/130603954/6411086.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_off00006cfc.bin
f9ddda0b1664a37c6f3fea70d663332a08639ccc600bcf100ad7057d4014d31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 7592 bytes

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