Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a4f713b1bb6760…

MALICIOUS

PDF

38.5 KB Created: 2020-03-20 11:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2b8878f46c780aeed3e3a69426bd8fed SHA-1: a8d59865fec848f206c6ef0c76f47ced3fd6874b SHA-256: 86a4f713b1bb676043afc43ce35ff01a331dfc9f7728c995e35c5c41b7e16b4b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to content designed to manipulate search engine rankings or host further malicious payloads.

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://murraywhiteley.com/uploads/1/3/0/6/130604566/130604566.html#canon+mp11dx+calculator+manual PDF link annotation
    • http://risingstarcafe.net/uploads/1/3/0/6/130605314/tanalepafosurizezawu.pdfIn PDF document text
    • http://education-mindset.ca/uploads/1/3/0/3/130323455/lelokin-jojagunovede-wunumonomegapox-migubapomejas.pdfIn PDF document text
    • http://elliott-wright.com/uploads/1/3/0/2/130288986/fdbca8.pdfIn PDF document text
    • http://teatrforte.pl/uploads/1/3/0/6/130605203/zegiluw_wesikasari_ragun_vizufiwux.pdfIn PDF document text
    • http://lukevanbrabant.com/uploads/1/3/0/7/130739934/4504204.pdfIn PDF document text
    • http://northmont.net/uploads/1/3/0/6/130604884/4a0f138cd49d.pdfIn PDF document text
    • http://ringsking.biz/uploads/1/3/0/4/130476502/f6d4e40.pdfIn PDF document text
    • http://lrjrhawks.info/uploads/1/3/0/5/130541211/5046776.pdfIn PDF document text
    • http://complementarybuddhism.com/uploads/1/3/0/3/130379798/65a928ee0c96f24.pdfIn PDF document text
    • http://atlshoebank.com/uploads/1/3/0/6/130620838/b4258e7.pdfIn PDF document text
    • http://somersetfoodtrail.org/uploads/1/3/0/3/130313176/9362902.pdfIn PDF document text
    • http://www.siamthaithaicuisineonline.com/uploads/1/3/0/7/130739454/fa2404ef027255c.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
🗂 Part of campaign: espaijove.info 3 samples

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 7836 bytes
SHA-256: d4b0efe358907f780f54724e8b97921eae625f07059a48487bf7f0f6b4736804