Malicious PDF — malware analysis report

Static analysis result for SHA-256 753f460ca9ee6a56…

MALICIOUS

PDF

51.9 KB Created: 2020-04-15 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0d5083796489b19d4ca71c8f4ddc1a3 SHA-1: 18a65a113cdb2ec7bf9cc8f6222893af79ef13ef SHA-256: 753f460ca9ee6a56d4eed7bea3e61f6afe793e2b848a3073c951951d5719a62a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be a lure, referencing 'Android developer nanodegree github'. This suggests the document is part of a phishing or credential harvesting campaign.

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://redlinelending.net/uploads/1/3/0/8/130814216/130814216.html#android+developer+nanodegree+github
    • http://evynmoon.com/uploads/1/3/1/3/131384600/1468865.pdf
    • http://willardsbbqjunction.com/uploads/1/3/0/6/130605306/sawelodopid_zilopiwevulugep_lasamomoro_mowodupumageke.pdf
    • http://karenjrohrlach.com/uploads/1/3/1/4/131437461/kiguroxoki.pdf
    • http://kulishillsidepasture.com/uploads/1/3/1/1/131164038/gunalasafeladem_posepe_bivugit_xirotufolej.pdf
    • http://avdate.com/uploads/1/3/0/9/130970015/cfb289e2f5c.pdf
    • http://traffic-jamz.com/uploads/1/3/0/7/130739223/5909096a29e69.pdf
    • http://platblock.com/uploads/1/3/1/0/131070044/8585039.pdf
    • http://brandupnow.com/uploads/1/3/0/5/130588295/4411167.pdf
    • http://gleneve.net/uploads/1/3/0/7/130776476/2031b7bb2bb.pdf
    • http://thewellnesscoaches.com/uploads/1/3/1/1/131163917/vekebegetijinefes.pdf
    • http://elpasoalfalfa.org/uploads/1/3/1/3/131383604/vofoluduzizubu_kexapokopen_gofomuwux_sizizaropuselus.pdf
    • http://dreamcollectors.org/uploads/1/3/0/4/130477176/47a32672d8b.pdf
    • http://pgabag.com/uploads/1/3/1/4/131437891/lunadozanoze.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e5f.bin
4792d9db918d157d8c6199baf02a4c5084e2e678e6b29317afdadc4c3ad23dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5F 8284 bytes
font_01_sfnt_off0000ae5f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5F 16036 bytes

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