Malicious PDF — malware analysis report

Static analysis result for SHA-256 70223c55fc2549e2…

MALICIOUS

PDF

52.7 KB Created: 2020-03-22 14:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df2abb2c1aa43901783eecf8dbd1f32f SHA-1: 411884bb3c26198086ad883fe39c586bb0202e89 SHA-256: 70223c55fc2549e2b827f9ca16020073781e993a502dbbfbca0c0c94c5b249dd
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious and indicative of a malicious intent, possibly to manipulate search engine results or to serve as a landing page for phishing or malware distribution.

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://pragueprivatetransfers.com/uploads/1/3/0/9/130968935/130968935.html#grupo+funcional+delos+alcoholes+quimica
    • http://ajautosalesva.com/uploads/1/3/0/7/130775683/xivuzotujulogupob.pdf
    • http://londontoursandtravels.com/uploads/1/3/0/4/130488885/lanufuzunit.pdf
    • http://mswoodman107.com/uploads/1/3/0/2/130291471/d3ccf.pdf
    • http://iwantashton.com/uploads/1/3/0/8/130813557/vojol.pdf
    • http://www.flitecluboc.com/uploads/1/3/0/7/130740610/wuvokim-fomaxuk-teladutisetuve-palikoxeger.pdf
    • http://coleenandjoe.com/uploads/1/3/0/9/130969826/8373276.pdf
    • http://medihealthconsulting.com/uploads/1/3/0/3/130323212/batosi.pdf
    • http://firesidetech.net/uploads/1/3/0/6/130604086/jonoxotuwimuj_redor_fuvezemeg.pdf
    • http://iasl.co.nz/uploads/1/3/0/5/130538902/ecf3b4.pdf
    • http://lakeviewtheseries.net/uploads/1/3/0/6/130605324/832c1a3a9c9.pdf
    • http://www.kelseyandmichael.rominastiebenphotography.com/uploads/1/3/0/4/130436159/4fa03d7a85dc.pdf
    • http://www.createdesignrestore.com/uploads/1/3/0/2/130288630/af28e320af4a.pdf
    • http://liveloveyoga.ca/uploads/1/3/0/6/130605073/zekawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081fd.bin
f108699430d2750ba02f49147e273de4e2a34b2741af693cb7e80e2988c4d955
pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 9768 bytes
font_01_sfnt_off0000a4aa.bin
ef56800321575c4cdac6f1c4af3b8199871638fd5d219ef2441f058b682d8814
pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AA 2708 bytes
font_02_sfnt_off0000ae57.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE57 16036 bytes