Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bdf9dd74578eb3…

MALICIOUS

PDF

37.5 KB Created: 2020-03-25 04:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dafb58cdbab33f5612271661f182e51e SHA-1: d851050cc230536324d1df003a05d20ad8caa69e SHA-256: 93bdf9dd74578eb35e7171a3306deb581f299c8d76d2650508063e9e340aad20
94 Risk Score

Malware Insights

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

The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links within the document, a common tactic for SEO manipulation or directing users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. The embedded URLs, such as http://goldstarbuildersllc.com/uploads/1/3/1/1/131163734/131163734.html#conversion+de+ft3%2Fmin+a+m3%2Fs and http://jevasconpower.com/uploads/1/3/0/4/130483725/7070006.pdf, are likely part of this link farm, aiming to drive traffic or deliver further 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://goldstarbuildersllc.com/uploads/1/3/1/1/131163734/131163734.html#conversion+de+ft3%2Fmin+a+m3%2Fs
    • http://jevasconpower.com/uploads/1/3/0/4/130483725/7070006.pdf
    • http://royleadbeatersculptures.com/uploads/1/3/0/7/130776616/74c91.pdf
    • http://plusroyalty.net/uploads/1/3/0/6/130640223/vasovarufeg.pdf
    • http://www.abetterfist.com/uploads/1/3/0/6/130605299/beramo.pdf
    • http://www.fuzzypeachrabbitry.com/uploads/1/3/0/7/130775837/zurutusex-xaxagirikof-sifevejudoru-pudavevu.pdf
    • http://unrealin.com/uploads/1/3/0/8/130813975/9a6c95bac0c.pdf
    • http://iamallsmiles.com/uploads/1/3/0/7/130739493/8950726.pdf
    • http://kiddomore.com/uploads/1/3/0/4/130436365/5023717.pdf
    • http://admin.flofest.uk/uploads/1/3/0/4/130491513/25e4433703.pdf
    • http://romasenzaglutine.com/uploads/1/3/0/4/130488969/ninap.pdf
    • http://reboundat.com/uploads/1/3/0/7/130739330/7e1f3938f3bddb.pdf
    • http://www.bisp.org.uk/uploads/1/3/0/2/130287246/xibutadarote-dositagunamakal-fexilojebukorew.pdf
    • http://www.myvarietyshop.uk/uploads/1/3/0/3/130379415/9830635.pdf
    • http://wvonjtw.sites.looka.com/uploads/1/3/0/8/130874213/5059c.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_off000069e2.bin
b0856419c5c8d4cdde5cd39d8968cd1c261251ae92bef57265302e945f67a667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 8160 bytes

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