Malicious PDF — malware analysis report

Static analysis result for SHA-256 789aa10afbf6f9f7…

MALICIOUS

PDF

45.2 KB Created: 2020-03-11 07:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 370b8b812a7f6aa36109dd02deee2391 SHA-1: b2764b03e753cd10e563c761cbc413966e5a2dad SHA-256: 789aa10afbf6f9f74452bd5c738ce61f816783466e167e4163251ff99185b921
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 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The embedded document body text, while appearing innocuous, is likely a lure to disguise the malicious nature of the embedded links. No scripts were extracted, but the sheer volume of outbound links points to a content-driven attack.

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://rockandrowel.com/uploads/1/3/0/8/130813667/130813667.html#how+does+blood+flow+through+the+fetal+heart
    • http://www.mithranm.com/uploads/1/3/0/3/130379132/rupujuf.pdf
    • http://golfconnectsne.com/uploads/1/3/0/5/130590672/6d4f60a93d.pdf
    • http://gftservices.net/uploads/1/3/0/5/130540352/243217.pdf
    • http://meridianspire.com/uploads/1/3/0/6/130620853/e4dac65cebd322.pdf
    • http://tokopedias.com/uploads/1/3/0/2/130288430/6187439.pdf
    • http://www.aucourantimage.com/uploads/1/3/0/6/130620840/redawipa.pdf
    • http://ganbeiliquor.com/uploads/1/3/0/7/130739415/6363421.pdf
    • http://www.ladyinfernoslacrosse.com/uploads/1/3/0/7/130738644/3475851.pdf
    • http://infoblicity.com/uploads/1/3/0/4/130435893/8539530.pdf
    • http://www.theluckyfewbooksandfundraising.com/uploads/1/3/0/4/130489359/tubiz_larudon.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d2f.bin
04ed6c8d4a151dfeab8bb7f0072c7b585895720671e7f622b7134b436182b2b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2F 7940 bytes
font_01_sfnt_off00009bfe.bin
fb259ff48409027ac17816e828bcb33adfa417f6a3252829e622cd79e1389fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFE 3284 bytes

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