Malicious PDF — malware analysis report

Static analysis result for SHA-256 61335ae96b3f57e7…

MALICIOUS

PDF

35.0 KB Created: 2020-03-20 12:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ce070255a0b500a2ef0c6f3ff5d9e2a SHA-1: 4daf2104cb5a65f181127e11f3f82a0990715d01 SHA-256: 61335ae96b3f57e7119dfe7cb1996b8e19fd9ec7c36d82ded4fe43510fe59b36
136 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to numerous other PDF files, likely for SEO manipulation or to host malicious content. The document body text, though partially corrupted, mentions 'Precision nuwave induction cooktop instructions' as a lure to encourage clicks on the embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF_RANDOM_URL_LINK heuristic identified algorithmically generated URLs, suggesting a coordinated malicious effort.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://joyfulcrone.com/uploads/1/3/0/6/130622114/130622114.html#precision+nuwave+induction+cooktop+instructions
    • http://kodzie.com/uploads/1/3/0/7/130775646/liwiralivukaraz.pdf
    • http://pestcontrolwiltshire.com/uploads/1/3/0/7/130776211/9546469.pdf
    • http://techtutorct.com/uploads/1/3/0/8/130813658/3896993.pdf
    • http://apple-caien.com/uploads/1/3/0/2/130289393/1724832.pdf
    • http://tattoovictoriatexas.com/uploads/1/3/0/5/130541077/7788206.pdf
    • http://www.balineckandbackcentre.com/uploads/1/3/0/2/130272478/c1ceb1fe46a8c.pdf
    • http://www.mastinseptictank.com/uploads/1/3/0/5/130588944/3949455.pdf
    • http://www.ksanieuwkerke.com/uploads/1/3/0/5/130588597/3574892.pdf
    • http://bestofbothheatingnair.com/uploads/1/3/0/6/130639397/dizovipemiru-nebajaladovonet.pdf
    • http://hostmaster.waytobe.net/uploads/1/3/0/6/130639509/a1a69cb5cdb96a.pdf
    • http://biomedicalwritingandeditingbyl.com/uploads/1/3/0/4/130483200/gigor-sitapumepojuz-nibobojak.pdf
    • http://isakkdesign.com/uploads/1/3/0/5/130589126/figejinudexozo.pdf
    • http://gaelbourgeois.ch/uploads/1/3/0/6/130604560/de87171.pdf
    • http://www.catholicartistconnection.com/uploads/1/3/0/6/130621418/a1938.pdf
    • http://beinvaluabletoday.com/uploads/1/3/0/4/130436049/sepitopifatode.pdf
    • http://drliannebrown.com/uploads/1/3/0/6/130604928/8142081.pdf
    • http://www.kittywatchjapan.com/uploads/1/3/0/2/130288426/wiwaz-wibifudu.pdf
    • http://hostmaster.broughton-deli.co.uk/uploads/1/3/0/6/130639139/jovuvekurudot-damizixox.pdf
    • http://grijzegeuzen-antwerpen.be/uploads/1/3/0/2/130272339/sezanirakipukamom.pdf
    • http://christopherstcyr.com/uploads/1/3/0/2/130271142/rekuvoko.pdf
    • http://webmail.daddydz.com/uploads/1/3/0/6/130620943/246ba33.pdf
    • http://kevinadventures.com/uploads/1/3/0/7/130776233/4451162.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_off00005fb2.bin
f6192aa2d231460dcb0b4bd81f32b1ac3239175e911a38d4216941ec1438304c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 7888 bytes

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