Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b9ce565ec60ad1…

MALICIOUS

PDF

42.9 KB Created: 2020-03-27 04:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8d2bfd1ad3b16cd283a55d882ec0560 SHA-1: 31a65130353f129b481b95940802fadc2eb33feb SHA-256: 40b9ce565ec60ad1e68f0376daf44bde8b073faf883cc9aa9875f9131b96939f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, many of which appear to be SEO-optimized PDF files. This suggests a link farm or traffic redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves luring users to these external resources.

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://bmajorevents.net/uploads/1/3/0/2/130272283/130272283.html#como+hacer+un+cuento+navide%C3%B1o+corto
    • http://xianggangbocaiwang.br3h.com/uploads/1/3/0/6/130621176/xejaxedatiz-fesemogepepamid-fisumik-gegidiv.pdf
    • http://chicandmeconsignment.com/uploads/1/3/0/5/130539182/murakize.pdf
    • http://sewdivinecreations.com/uploads/1/3/0/3/130323377/fowejutalazuvuf_fiwalam.pdf
    • http://plussizebridalsvt.com/uploads/1/3/0/6/130621248/bamobijuxumowavu.pdf
    • http://dejongedenkers.nl/uploads/1/3/0/9/130969305/pogusutunalumovuraji.pdf
    • http://www.kimberleyfoodie.com.au/uploads/1/3/0/6/130639364/boxebuz.pdf
    • http://countryharvestpantry.com/uploads/1/3/0/8/130814630/murajotex_bumiwovaratu_xugiwipob.pdf
    • http://mostwantedinktattoos.com/uploads/1/3/0/5/130589180/gakeweporejasoz.pdf
    • http://www.bookheretravel.com/uploads/1/3/0/3/130323301/wunejituvip.pdf
    • http://brainloom.com/uploads/1/3/0/5/130590157/kemixeta-delobiwodajejos-lulesamewer.pdf
    • http://towingserviceplantation.com/uploads/1/3/0/2/130272352/rovosexemewobakuzod.pdf
    • http://duojonssoncoudroy.com/uploads/1/3/0/3/130313038/ed971b.pdf
    • http://goodkarmabaskets.com/uploads/1/3/0/2/130287463/8037106.pdf
    • http://hostmaster.nojbarker.com/uploads/1/3/0/5/130589122/fewikubafebiz.pdf
    • http://loshermanosdos.com/uploads/1/3/0/5/130551782/juninifeladapa-tobukolux-litudifopare.pdf
    • http://surveypocket.com/uploads/1/3/1/0/131070325/wozigonizawot.pdf
    • http://bendetl.fr/uploads/1/3/0/3/130313507/4806856.pdf
    • http://english-log-cabins.com/uploads/1/3/0/4/130488442/xofuwubikejupal.pdf
    • http://bobcranephd.info/uploads/1/3/0/3/130323156/5f5a70f9.pdf
    • http://www.softechinc.net/uploads/1/3/0/6/130605347/8017647.pdf
    • http://djmir.net/uploads/1/3/0/6/130639535/zitolodif.pdf
    • http://www.myspazi.com/uploads/1/3/0/7/130776444/84890e5538682b.pdf
    • http://mlyterdogstudio.com/uploads/1/3/0/3/130313378/sukezuwiv.pdf
    • http://rucomingout.com/uploads/1/3/0/3/130324004/dagaremawetofub.pdf
    • http://nylsremodelingcorp.net/uploads/1/3/0/5/130550713/7522320.pdf
    • http://mlyterdogstudio.com/uploads/1
    • 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_off00007d13.bin
b03b43d65044d38dc6e19937d74c043b5946763517df815a20a34c7ff9f51cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D13 8320 bytes

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