Malicious PDF — malware analysis report

Static analysis result for SHA-256 293f406adce8161f…

MALICIOUS

PDF

32.0 KB Created: 2020-05-16 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22771f7d7a0fbffcff032dad4150b5ae SHA-1: 9b70cec8681880769f68d4cbc9748bd8890492d5 SHA-256: 293f406adce8161ffd5d857f0e6691db3a67e2c75fba2ec291fcd2062679dabe
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive link farm suggests a delivery mechanism aimed at driving traffic to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://indoorqualityaircody.com/uploads/1/3/0/5/130547576/130547576.html#xamarin+android+button+border+color
    • http://horizonsindianapolis.com/uploads/1/3/1/3/131384735/lapadawut.pdf
    • http://thehomilist.org/uploads/1/3/0/8/130814510/5e8a1a9ad.pdf
    • http://hildareikilover.com/uploads/1/3/1/3/131381658/lazubisukinagu.pdf
    • http://gteximports.com/uploads/1/3/0/7/130739303/5bec87365.pdf
    • http://totalinjection.net/uploads/1/3/1/4/131438098/mibutoweroxe.pdf
    • http://financialconsciousness.com/uploads/1/3/0/9/130969757/wifod-tamulexaz-wizawediwuf-botigo.pdf
    • http://buffbodychick.com/uploads/1/3/0/7/130776823/e01711.pdf
    • http://158west.com/uploads/1/3/0/4/130483773/nubakujejone_xivajupudeda.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000492a.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x492A 1800 bytes
font_01_sfnt_off000051b6.bin
770f7a87e0e2c21162014a9342315fa7a7d070c0d86665b23d3d0d146d729e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B6 10328 bytes

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