Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bbee92fce39a20…

MALICIOUS

PDF

34.6 KB Created: 2020-04-06 12:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c49c956d91fe0a9b5e2feed7baeb6694 SHA-1: 9bb8233ef38d0ae94d37ee95bbd30cb530af6a9f SHA-256: d1bbee92fce39a20aa3a1e68971fca28b4fc9463e85072c8c5c779e1083fb9f6
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as a link farm, indicating a malicious intent to redirect users. The document body, though heavily obfuscated, contains references to educational material, likely serving as a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs supports a high confidence assessment. 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://xocobean.com/uploads/1/3/0/6/130621569/130621569.html#recorto+y+aprendo+cuarto+grado+para+imprimir
    • http://kellylcrawford.com/uploads/1/3/0/4/130488580/matuzodupubaj-lejazuzazifu-dotisodidikek-gapubaxa.pdf
    • http://hassinvest.be/uploads/1/3/0/4/130488979/2208253.pdf
    • http://118zoia.com/uploads/1/3/0/2/130288481/nibadazidin-gaxavofumiw.pdf
    • http://aaronag.net/uploads/1/3/0/5/130588747/dc3aa6a781.pdf
    • http://smokinobbq.com/uploads/1/3/1/4/131407846/bajetunon_rolipumujenuvo_mixolusufike.pdf
    • http://myjusfit.com/uploads/1/3/0/6/130639317/jemile.pdf
    • http://tavijuarez.com/uploads/1/3/0/5/130539516/wibilotedeporixafi.pdf
    • http://btecrecycling.com/uploads/1/3/0/7/130740129/4678251.pdf
    • http://centretiotiahke.com/uploads/1/3/0/6/130621916/df1155d06667.pdf
    • http://baudlbears.com/uploads/1/3/0/7/130740202/fegipuramosefas.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_off00005cda.bin
54a27812c84cbdf90856608fbde150453cd118b223a16927cb7567cb92dbbd06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDA 8976 bytes

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