Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb80c67e7660d72…

MALICIOUS

PDF

33.0 KB Created: 2020-05-30 01:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0da1c4c9fb457394b714c9aa2a37363 SHA-1: 5340d071377cf864ddae67c1dc32b4b768e4b6e7 SHA-256: 1cb80c67e7660d722db89b593a037795e480c4fe7b7dfb9fc9586237b119e654
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous unknown URLs suggests a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 3

  • 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
  • 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://postmaster.crewbazaar.com/uploads/1/3/1/1/131164236/131164236.html#reality+fighters+trophy+guide
    • http://mrlawnman.com/uploads/1/3/0/3/130312934/xoxobobukonubo-rowavuxibapi-muwupunaz-vapuliropopawi.pdf
    • http://mta-sts.mail.ewisely.org/uploads/1/3/0/6/130604320/7ce94159bd1f7.pdf
    • http://maloriearisumifineart.com/uploads/1/3/0/6/130604833/wibutofovusikinidiji.pdf
    • http://telluridecleaningcompany.com/uploads/1/3/1/6/131637125/34c521626b72e.pdf
    • http://petesplacefamilyrestaurant.ca/uploads/1/3/0/9/130968913/jaxanaj.pdf
    • http://ecuapymes.ec/uploads/1/3/0/6/130605482/721f278f62a19.pdf
    • http://mx.timbrownvintagecamper.com/uploads/1/3/0/7/130776418/a77c74a7694.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_off00005830.bin
0fa57b14038df2c830f4d340efa5145745ab98853a23b54ac3fc1afac6bb3e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5830 9668 bytes

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