Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f37ee4c45cb5b67…

MALICIOUS

PDF

39.2 KB Created: 2020-03-24 21:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3bc854d26aa744aea5c3c618b7cbde42 SHA-1: 667cda8dd292e8f6314c75be7bd99109268a90c3 SHA-256: 5f37ee4c45cb5b67fd203612064c05b18d7e3f4b9c43b29ebcc8cc7b899e6c79
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO link farms. One prominent link, disguised as a Logitech remote software download, is likely a lure to trick users into visiting a malicious site. The ML classifier also strongly indicated maliciousness, supporting the advance-fee scam lure heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://edgelandscapeandmaintenance.com/uploads/1/3/0/6/130604209/130604209.html#logitech+harmony+520+remote+software+download
    • http://hbconstructors.com/uploads/1/3/0/4/130476940/bulebarafinunu.pdf
    • http://londonbusinesswebdesign.co.uk/uploads/1/3/0/8/130814347/rotunige.pdf
    • http://vendoradvocacyguild.org/uploads/1/3/0/7/130775021/2b55758b564d5.pdf
    • http://testsite.online/uploads/1/3/0/5/130551981/loridogemewuriz-powovivezezok.pdf
    • http://nelsonlawfirm.org/uploads/1/3/0/7/130776388/bdeb05f.pdf
    • http://www.mauritskoelewijn.nl/uploads/1/3/0/2/130270924/3b555e3.pdf
    • http://mail.hoosierhideaway.com/uploads/1/3/0/4/130477335/bavebenadiwuji.pdf
    • http://keithmannen.net/uploads/1/3/0/6/130621628/c6bff.pdf
    • http://breaklocator.com/uploads/1/3/0/4/130476066/rinofazig.pdf
    • http://smoth.apkroad.com/uploads/1/3/0/8/130813837/2181953.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_off000070e2.bin
ea45c36bb613cd3216747d305eba491ebcdf6ce73aa69a0e33dcbcd040fefb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 8068 bytes

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