Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60039fce1996265…

MALICIOUS

PDF

38.4 KB Created: 2020-04-01 22:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dac02e314d6895737eee2685dc83a161 SHA-1: 38942d0b17e2fba2d0cdbb35c8ad871c46476eb4 SHA-256: b60039fce1996265aff6f762d9ab60278e2b89d995fed1eeb6d700afd860d78b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body primarily contains metadata and the embedded URLs.

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://robertslifeandtravelvlog.com/uploads/1/3/1/4/131438758/131438758.html#analytic+philosophy+syllabus
    • http://kanoaphotography.com/uploads/1/3/0/5/130545633/5653575.pdf
    • http://alliedhealthcaremanagement.com/uploads/1/3/0/5/130551210/7466469.pdf
    • http://designnextdoor.net/uploads/1/3/1/3/131381052/3946625.pdf
    • http://simplecity.us/uploads/1/3/0/5/130588282/nurozirirofipogozugu.pdf
    • http://highfrequencypilates.com/uploads/1/3/0/3/130313803/1534218.pdf
    • http://ayurvedayogainmind.com/uploads/1/3/0/7/130740625/4b4cca22792b.pdf
    • http://from-the-secret-place.com/uploads/1/3/0/3/130323092/kefasorur.pdf
    • http://baoandtea.com/uploads/1/3/0/5/130551524/tidaxav-muzuz-gibaxeduku.pdf
    • http://adamdeutch.com/uploads/1/3/0/6/130604287/4342075.pdf
    • http://jmbrmtgroup.com/uploads/1/3/0/5/130544591/f1e5821d.pdf
    • http://hiawathaparkfriends.org/uploads/1/3/0/6/130620565/1aec9f6691f51e.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_off0000698a.bin
fc5159b65183747c886a0e42afd150259f3204b381559797daa54b056365c7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 9356 bytes

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