Malicious PDF — malware analysis report

Static analysis result for SHA-256 3413cd8be847598f…

MALICIOUS

PDF

56.5 KB Created: 2020-04-02 04:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a740b24eb982fce65f5940b6964bd6c9 SHA-1: 4ddad0df1740f5e16a2eb323b37237099d4f1838 SHA-256: 3413cd8be847598f06050cf86454a9eee0f2d73acd8c1a0cbc196b63f3774340
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment. The document body itself is largely obfuscated but contains a URL that appears to be the primary lure.

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://sevirtuallearning.com/uploads/1/3/0/4/130483801/130483801.html#ubicacion+geografica+de+mesopotamia+china+india+y+egipto
    • http://slideshowandtell.com/uploads/1/3/1/0/131071076/labezima_runujo.pdf
    • http://recardiolt.xyz/uploads/1/3/0/4/130483279/xusaturetirazi.pdf
    • http://rocketleaguerewards.net/uploads/1/3/0/6/130604492/6572c.pdf
    • http://agentbrassband.com/uploads/1/3/0/6/130639222/ridezeni-fejimolekaw-getef-sumezajuvurebu.pdf
    • http://virginiaconcretepaving.com/uploads/1/3/0/4/130483614/631ce124df7.pdf
    • http://patriotreport.us/uploads/1/3/1/4/131408027/7916732.pdf
    • http://monthlymovers.net/uploads/1/3/0/6/130621579/ce9c1c1d.pdf
    • http://irwinmusicacademy.com/uploads/1/3/0/8/130873932/1466776.pdf
    • http://johannesenstad.com/uploads/1/3/0/5/130588499/naxewixe.pdf
    • http://empowerhealthwellness.com/uploads/1/3/0/2/130288534/931d2.pdf
    • http://peace-on-demand.com/uploads/1/3/1/3/131379712/juxosomoj.pdf
    • http://dreamsofsoundstudios.com/uploads/1/3/0/2/130274315/c5adce653a9aa2.pdf
    • http://udcarcaixent.com/uploads/1/3/0/5/130550797/zivamol.pdf
    • http://pitchhunter.net/uploads/1/3/0/5/130543369/27c0becacb90c02.pdf
    • http://mysticgardentw.com/uploads/1/3/0/7/130738912/3d1815704c.pdf
    • http://stucampana.com/uploads/1/3/1/3/131379179/9febb.pdf
    • http://ameliaearhartdaughterofthesky.com/uploads/1/3/0/5/130551770/3382dab539270.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a8e.bin
c4797d315f69ce7697708197a182156630562a0e86f550255db68a620b5ab182
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8E 9992 bytes
font_01_sfnt_off0000bd35.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 16036 bytes