Malicious PDF — malware analysis report

Static analysis result for SHA-256 b277cce4ad15efb1…

MALICIOUS

PDF

31.8 KB Created: 2018-06-11 08:28:21 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 04ad9032ae55b6023177e4eb60e04e9b SHA-1: 18e657f31034ae2f6a462109d733699518e058b4 SHA-256: b277cce4ad15efb1e9278dd493f21543428dad0c1c6b6f80a0abbf173f13b04b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded URIs pointing to suspicious domains, specifically 'uncpbisdegree.com', which are likely used to host or deliver a secondary payload. The document body, though partially corrupted, suggests a lure related to a 'toyota avensis verso wiring diagram', combined with a visual download button heuristic, indicating a social engineering attempt to trick the user into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9426

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uncpbisdegree.com/download3.php?q=toyota-avensis-verso-wiring-diagram.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=toyota-avensis-verso-wiring-diagram.pdfIn PDF document text
    • http://www.oldclassiccar.co.uk/modernads_make/toyota.htmIn PDF document text
    • http://www.autogenius.info/volkswagen-transporter-t5-essentials-from-september-2009-fuse-box-diagram/In PDF document text
    • http://www.autogenius.info/gmc-yukon-2005-2006-fuse-box-diagram/In PDF document text
    • https://www.dybvik-trading.no/mystore-images/canm8.xlsIn PDF document text
    • http://www.oldtoyotaclub.com/phpBB3/viewtopic.php?t=1048In PDF document text
    • https://www.guloggratis.dk/s/q-vauxhall/In PDF document text
    • http://jujaitaly.net/In PDF document text
    • http://riverside-resort.net/1/volvo-fh12-service-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/social-psychology-4th-canadian-edition-test-bank.pdfIn PDF document text
    • http://uncpbisdegree.com/1/simple-leaf-cell-diagram-for-kids.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-battles.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-greek-myths-vol-1.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-j-paul-getty-museum-handbook-of-the-antiquities-collection.pdfIn PDF document text
    • http://riverside-resort.net/1/verilog-code-for-division.pdfIn PDF document text
    • http://uncpbisdegree.com/1/techmax-easy-solution-bee.pdfIn PDF document text
    • http://uncpbisdegree.com/1/speed-queen-lgs17a-dryers-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/vupoint-solutions-magic-wand-portable-scanner-user-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/ToyotaIn PDF document text
    • https://www.manualslib.com/manual/1212416/Toyota-Pt546-00140.htmlIn PDF document text
    • https://www.manualslib.com/brand/toyota/car-stereo-system.htmlIn PDF document text
    • https://www.manualslib.com/products/Toyota-Pt546-00140-6027077.htmlIn PDF document text
    • https://www.manualslib.com/manual/654555/Toyota-Tns-500.htmlIn PDF document text
    • https://www.manualslib.com/brand/toyota/car-navigation-system.htmlIn PDF document text
    • https://www.manualslib.com/products/Toyota-Tns-500-3202863.htmlIn PDF document text
    • https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fwww.dybvik-trading.no%2Fmystore-images%2Fcanm8.xlsIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DA_EN&a=https%3a%2f%2fwww.guloggratis.dk%2fs%2fq-vauxhall%2fIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000416e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x416E 10248 bytes
SHA-256: 112bf87bb81a8409921d4a4e189b683e8941eceed86fe87a2ecc741785626529
font_01_sfnt_off00006213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 7072 bytes
SHA-256: 080f49a7fc4ccf45f96c4ad739f879b5c6909587c99afa5805e54f490ba2159f