Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9a3f880df17e3a…

MALICIOUS

PDF

41.9 KB Created: 2020-03-22 04:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2c7ebb9e6e96489889064b1254d8908 SHA-1: 695c24c6112bff3826a49325c88eefbc6da1f9ee SHA-256: af9a3f880df17e3aa9be12d3fcca1570dc7653e50bf0af5f70e82d7ff7c07868
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains a URL that is also present in the list of extracted URLs, indicating a potential lure for users to click on these links.

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://barrusmemorialrace.com/uploads/1/3/0/6/130621682/130621682.html#10+ejemplos+de+extranjerismo+de+mexico
    • http://www.advicebyjulia.com/uploads/1/3/0/7/130739786/4350e8bde3515b6.pdf
    • http://vegandoctor.org/uploads/1/3/0/6/130621392/wugozibewelisekiso.pdf
    • http://crcoachingandconsultancy.com/uploads/1/3/0/6/130621357/momamez.pdf
    • http://molll.online/uploads/1/3/0/7/130739165/madem.pdf
    • http://centralrefrigerationinc.us/uploads/1/3/0/5/130588594/1109516.pdf
    • http://huestay.org/uploads/1/3/0/2/130287991/d6384ddd48.pdf
    • http://hostmaster.thomasduesel.ch/uploads/1/3/0/2/130272636/nalovumil_kunajezim_sosilulo.pdf
    • http://pisec.org/uploads/1/3/0/8/130814758/ad24ca23f2.pdf
    • http://cre8vdigitalphoto.com/uploads/1/3/0/5/130589302/3e8b2.pdf
    • http://meikeourvillagehall.com/uploads/1/3/0/7/130738752/gozevalowefa.pdf
    • http://www.austulc.com.au/uploads/1/3/0/9/130969449/9730244.pdf
    • http://blueeyesandcowpies.com/uploads/1/3/0/4/130478704/2429208.pdf
    • http://capitolhillclubmembers.com/uploads/1/3/0/4/130476912/luvanonabitinuz_gasikotu_neribuje_nujepufolunifod.pdf
    • http://cneachome.com/uploads/1/3/0/4/130489123/tovixoxenu.pdf
    • http://fireeducators.com/uploads/1/3/0/4/130483477/2331088.pdf
    • http://www.seaportlights.com/uploads/1/3/0/5/130588710/xozoxiwi.pdf
    • http://usmvmc-cny.org/uploads/1/3/0/3/130379239/soruwexi.pdf
    • http://phdla.net/uploads/1/3/0/6/130620747/cd1339f75f070e4.pdf
    • http://tovasdesign.com/uploads/1/3/0/3/130313741/b0948d171.pdf
    • http://thomashartptnc.com/uploads/1/3/0/5/130590503/9784223.pdf
    • http://hostmaster.darlingtonlecture.org.uk/uploads/1/3/0/5/130588617/migazolukif-dixoleviz-fajapiduranurik-guruwazalajin.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_off00007908.bin
f904592b7a641e90cc49d4bcbb03e0ab9de47249e0a12a08333a3e76b3b84009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7908 9428 bytes

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