Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f78218d048df952…

MALICIOUS

PDF

49.8 KB Created: 2020-04-02 09:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c742814acb03af68051317cf54b785df SHA-1: 7fe6ae903334b46f72463c40e7457e78eed3b029 SHA-256: 3f78218d048df952a43d2ac9b995121dad09934ab6373d50320f1cace1c21dbd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to these URLs. The primary function appears to be directing users to a vast collection of other PDF files hosted across numerous domains, suggesting a link farm or SEO spamming operation. No scripts were extracted from this sample.

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://michaelshusko.com/uploads/1/3/0/7/130776344/130776344.html#new+vam+thread+blanking+dimensions
    • http://smedbergpalss.com/uploads/1/3/0/4/130489564/4075443.pdf
    • http://porno4link.com/uploads/1/3/0/4/130436140/bowugisitepuge-nukinufewibofup.pdf
    • http://thelipstickbandit.com/uploads/1/3/1/1/131163733/watikebafalanef_sulefurovidaki.pdf
    • http://primarilylove.com/uploads/1/3/0/2/130272638/favarigu-damakasipe.pdf
    • http://shopnauticaldecor.com/uploads/1/3/1/3/131380589/4288132.pdf
    • http://byillc.net/uploads/1/3/1/3/131383441/7ee77f6e133ce9b.pdf
    • http://realhopeyouthcenter.org/uploads/1/3/0/5/130550937/9387098.pdf
    • http://kansascitydoorsandclosets.net/uploads/1/3/0/5/130550830/simapigosij.pdf
    • http://healthinformationcentre.net/uploads/1/3/0/5/130547038/besirepap-mivadudigaredan.pdf
    • http://rhemayoga.org/uploads/1/3/1/1/131164364/bovugivi-dupota-ragika-xudaw.pdf
    • http://soulsnatcher.shop/uploads/1/3/0/5/130588426/c624f3c1521454a.pdf
    • http://bratshop.co/uploads/1/3/0/2/130292007/e9051c9d6fc7.pdf
    • http://lg-consultants.net/uploads/1/3/1/0/131070753/kobetaravupulex.pdf
    • http://indyphotofun.com/uploads/1/3/0/7/130776865/dosazojopat.pdf
    • http://ececonline.org/uploads/1/3/0/4/130490833/071daa.pdf
    • http://hendrixroadbaptist.org/uploads/1/3/0/4/130435590/0bb4756.pdf
    • http://listenresearchwrite.com/uploads/1/3/0/3/130313320/277118cddea5.pdf
    • http://fanaticalyankeenfldraftscoutingreports.com/uploads/1/3/0/6/130639395/ab205d60d44ec.pdf
    • http://www.ehlersdanlosaustralia.com/uploads/1/3/0/6/130620668/1109247.pdf
    • http://cyberdaycare.com/uploads/1/3/0/6/130639547/risafevule.pdf
    • http://vizimath.net/uploads/1/3/0/3/130313286/6930883.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_off000096db.bin
b02d199af5900309375ab0f79ab24f954185d540b284f2047fc593b8b90415c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x96DB 8600 bytes