Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ed2d681144fa1b…

MALICIOUS

PDF

41.3 KB Created: 2020-03-21 19:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b8460c2faee9b9bef87d10fe33d237e SHA-1: b418e01588b268bcafa66b58e1013428669b82f5 SHA-256: 17ed2d681144fa1b5ada60b1de8e901c4e0c6a8768e1af64111f4f6832606dd3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though partially corrupted, contains text related to an 'algebra literal equations worksheet' and references to the wkhtmltopdf tool, indicating a potential lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this 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://mysaphi.com/uploads/1/3/0/4/130476830/130476830.html#algebra+literal+equations+worksheet
    • http://webmail.bodypositivechile.com/uploads/1/3/0/5/130588954/6289129.pdf
    • http://iq-estore.com/uploads/1/3/0/7/130738639/2499431.pdf
    • http://orsalus.net/uploads/1/3/0/3/130379610/3982626.pdf
    • http://bodybycreation.net/uploads/1/3/0/6/130621985/fuxoba-sokawuniw-fibiwetakabu.pdf
    • http://bhutanforum.org/uploads/1/3/0/5/130551599/3ddbe0211c41.pdf
    • http://saronawillow.com/uploads/1/3/0/6/130639100/pozowazemikipomivin.pdf
    • http://junkyarddawgmd.com/uploads/1/3/0/6/130603783/nakijuwukuferip_xufime.pdf
    • http://hostmaster.asilosteinerianolecco.it/uploads/1/3/0/6/130620567/5048269.pdf
    • http://hostmaster.faraz.photography/uploads/1/3/0/5/130588678/gevudaledi.pdf
    • http://austinlair.com/uploads/1/3/0/4/130436282/zavizat.pdf
    • http://noraiptv.org/uploads/1/3/0/5/130551057/1c1c2609fec2dd.pdf
    • http://brightpassiveincome.com/uploads/1/3/0/4/130477351/fekimoxasagi.pdf
    • http://mgodfreycreative.com/uploads/1/3/0/2/130288533/xikovuxetugok-nabikosur-julerelirerad.pdf
    • http://www.residentialone.ca/uploads/1/3/0/5/130540010/f6e662.pdf
    • http://mta-sts.housenorthwest.com/uploads/1/3/0/7/130740522/nepifomitekamizax.pdf
    • http://webdisk.opticavistaandina.com/uploads/1/3/0/7/130775907/3c4305fd15e.pdf
    • http://retreatsinjapan.com/uploads/1/3/0/5/130539763/daligaxetepole_fefifi_vubefaxofabis.pdf
    • http://arncliffepreschool.com/uploads/1/3/0/4/130478203/zefajasogajovo.pdf
    • http://college-hacks.com/uploads/1/3/0/4/130489253/0af01ffa9376.pdf
    • http://bellemeadedentalcenter.com/uploads/1/3/0/2/130289313/1966425.pdf
    • http://premedicated.net/uploads/1/3/0/6/130639565/5060814.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_off000078ee.bin
d448c2acc92f9006ea559a4634fc70d2f64db7427c87c43e377ffd1643c27d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 7848 bytes

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