Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f19eb871954a087…

MALICIOUS

PDF

48.8 KB Created: 2020-03-21 15:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5423a78dbc07df61f08e98717948b08a SHA-1: eaecdb4444108cdc6075ce4eca383c693d59ab4b SHA-256: 0f19eb871954a08700b2a6df4b29562c875a378f09b8af26c2b73eeb74bd3fe1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body text, though partially corrupted, includes a question about life insurance policies and references the wkhtmltopdf tool, indicating a potential phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports a high confidence assessment.

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://kissbotr.com/uploads/1/3/0/8/130813612/130813612.html#what+is+the+face+value+of+my+life+insurance+policy
    • http://nature-frames.com/uploads/1/3/1/1/131164552/vijapevasifelonawiv.pdf
    • http://rorosenergyhealingcentre.com/uploads/1/3/0/5/130540197/bizajeba_togeguwam_jelojamuv_moguropuz.pdf
    • http://mail.linedriveindoorbaseball.com/uploads/1/3/0/4/130489220/a1d1dbe84cd5f4.pdf
    • http://helpthehungry.net/uploads/1/3/0/4/130476089/c208e3af.pdf
    • http://www.optuskickstart2020.com.au/uploads/1/3/0/2/130271207/bodikozaveba.pdf
    • http://3-yoga.com/uploads/1/3/0/6/130603688/7541485.pdf
    • http://www.pofofficial-calls.com/uploads/1/3/0/6/130639360/8806761.pdf
    • http://storedesigns.in/uploads/1/3/0/6/130604401/2618548.pdf
    • http://thainey.com/uploads/1/3/0/2/130289595/3653974.pdf
    • http://jacobgorrell.com/uploads/1/3/0/7/130738615/ddc34dca.pdf
    • http://www.kylewahl.com/uploads/1/3/0/4/130476721/145455.pdf
    • http://health-treatmentcenter.com/uploads/1/3/0/5/130588288/9876455.pdf
    • http://americaninfousa.net/uploads/1/3/0/4/130475901/pedekajum_jusesalibimix_najixuzukuni.pdf
    • http://mta-sts.agawegier.com/uploads/1/3/0/6/130604519/5061d.pdf
    • http://tonkaforce.com/uploads/1/3/0/4/130489006/6866028.pdf
    • http://www.schildersverenigingnederland.com/uploads/1/3/0/4/130483584/sezijut_buvitoko_nasajuvefi_sodiruli.pdf
    • http://lingeriestoresplano.net/uploads/1/3/0/9/130969529/9e1a92.pdf
    • http://mta-sts.mail.escapeartistswartown.com/uploads/1/3/0/5/130543158/3882338.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000814c.bin
d22ba071b849b614bdf5ca97dba2f9a3c7f9f2ba52c61475b0593cc30e7b3ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x814C 8040 bytes
font_01_sfnt_off0000a055.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA055 16036 bytes