Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7430b2fbaee0e6…

MALICIOUS

PDF

36.3 KB Created: 2020-06-03 20:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff1fd952fafafe67bcdb3513669bc71 SHA-1: 631a7d7790d9a123e99e76f3e80c0a75a5c99bae SHA-256: fd7430b2fbaee0e6e21ccea9b7c2212e6910f38f508b8ffc19acc1bc371ac79b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to SEO-optimized PDF hosting sites, a common technique for distributing malware or redirecting users to phishing pages. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure. No scripts were extracted, but the extensive link farm suggests a delivery mechanism for further malicious content.

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://a1106037xstreamtravel.xsideas.com/uploads/1/3/0/2/130289189/130289189.html#management+a+practical+introduction+7th+edition+pdf
    • http://acelopsolucionesquirurgicas.com/uploads/1/3/0/6/130620575/fimovesenevuvukakef.pdf
    • http://mail.vidairkennel.com/uploads/1/3/0/7/130740213/sewewaxota.pdf
    • http://computersupportcolumbus.net/uploads/1/3/0/8/130813798/fulimivofibo-repaz-fovirolokagonu-rotozabajeni.pdf
    • http://goldenblissbrand.com/uploads/1/3/0/5/130542717/nejigaxezav_todel_lalaporom_xolitejoliziv.pdf
    • http://raf3.org/uploads/1/3/1/4/131407117/rivuvabu_famuv_pegudape_pokuzejavodim.pdf
    • http://hvaband.net/uploads/1/3/1/1/131164127/bubujigemokukujew.pdf
    • http://permanailsmx.com/uploads/1/3/0/3/130313826/2231877.pdf
    • http://a1106037xstreamtravel.xsideas.com/uploads/1/3/0/2/130289189/terms.html
    • http://a1106037xstreamtravel.xsideas.com/uploads/1/3/0/2/130289189/dmca.html
    • http://a1106037xstreamtravel.xsideas.com/uploads/1/3/0/2/130289189/policy.html
    • https://famunuguraj492377956.files.wordpress.com/2020/06/kefujasonifulejive.pdf
    • https://doxeribovas.files.wordpress.com/2020/05/tuxovitad.pdf
    • https://velidiz165836138.files.wordpress.com/2020/06/divoxexegurigawutomug.pdf
    • https://kekerawigufa.files.wordpress.com/2020/06/kupupofaxilurananopaxaf.pdf
    • https://fiwukezebara.files.wordpress.com/2020/06/22097033424.pdf
    • https://jidinetobix.files.wordpress.com/2020/06/16188069939.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_off00006220.bin
0405bae78b5f752b5dee2404195ef8294c0c435dd1f0f899602742d8ce506fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 10356 bytes