Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc362b6a1a7d3262…

MALICIOUS

PDF

50.7 KB Created: 2020-03-07 22:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-12-25
MD5: 43578339450f3b5d49c3fd31a53fec3c SHA-1: 29fe6d5f51ce870a61e4b8020da002dafaac8326 SHA-256: bc362b6a1a7d32628761419da24e409156f790d31bc1ed1cc59ecda8a3dc8d86
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to potentially harmful sites.

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://www.ottawapostsuicidesupportteam.ca/uploads/1/3/0/4/130436080/130436080.html#extrinsic+and+intrinsic+motivation+questionnaire PDF link annotation
    • http://lisadesai.com/uploads/1/3/0/4/130483817/4482674.pdfIn PDF document text
    • http://www.leap4ward.org/uploads/1/3/0/7/130775659/zesuzel.pdfIn PDF document text
    • http://mta-sts.mx.pelegreenberg.com/uploads/1/3/0/7/130775431/xinoj_wabomob_kujobugixora_fimonuriw.pdfIn PDF document text
    • http://lawncarebenton.com/uploads/1/3/0/6/130639978/nularugasudilub-retikebaw-gewabivupewener.pdfIn PDF document text
    • http://islamicfinanceprofessor.com/uploads/1/3/0/5/130588370/vevarisusupemo-wenujen-lezagariku-puxev.pdfIn PDF document text
    • http://novomancy.net/uploads/1/3/0/6/130604307/9966365.pdfIn PDF document text
    • http://mail.debfrischmon.com/uploads/1/3/0/2/130289338/pozukafazevo.pdfIn PDF document text
    • http://reseautrans.net/uploads/1/3/0/5/130540767/vofenemotadaxa.pdfIn PDF document text
    • http://trinitycastle.com/uploads/1/3/0/6/130621095/joxiw.pdfIn PDF document text
    • http://conceptinteriorsct.com/uploads/1/3/0/6/130604720/lodixajopapexu.pdfIn PDF document text
    • http://tacticalvalkyrie.com/uploads/1/3/0/6/130621083/8532306.pdfIn PDF document text
    • http://organizingwithme247.com/uploads/1/3/0/7/130740019/2ba51cde.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0B 8224 bytes
SHA-256: 86116028d9558f17879f6872b50c476685963072ff4a0031ad20d8ceb1d8fb15

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