Malicious PDF — malware analysis report

Static analysis result for SHA-256 308e1c98a98f982f…

MALICIOUS

PDF

73.7 KB Created: 2020-04-04 13:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 171b7e3f239842d1c66c1eb18ed7275c SHA-1: 066b317897715d6f18635ac9d7fa81c3d11aa9c9 SHA-256: 308e1c98a98f982fb72082a85ae2fee04a9af6ffc12891c9e4176b3749429fb2
94 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a PDF SEO link farm. The ML classifier strongly indicated maliciousness. The embedded URLs and the document body, which includes a URL, suggest the primary goal is to redirect users to a network of websites. This is likely intended for SEO manipulation or to serve as a distribution point for further malicious content.

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://smallfryepublishing.com/uploads/1/3/0/6/130621431/130621431.html#what+is+sram+and+dram+in+hindi
    • http://visionpipetting.com/uploads/1/3/0/6/130639467/2559998.pdf
    • http://treadandwater.com/uploads/1/3/1/4/131454389/finimivukexelumok.pdf
    • http://cadeim.com/uploads/1/3/0/5/130538816/rofufa.pdf
    • http://markwilliamsmedical.com/uploads/1/3/0/7/130776673/kugawafozisazitixowa.pdf
    • http://teachmegeography.com/uploads/1/3/0/4/130491699/7141be75b1e2f.pdf
    • http://newlifeconstruction.net/uploads/1/3/0/9/130968992/5336648.pdf
    • http://psicolo.net/uploads/1/3/0/7/130739764/3760153.pdf
    • http://heartandhopehypnotherapy.com/uploads/1/3/0/3/130313358/a03a55b1d25.pdf
    • http://palmcityeye.info/uploads/1/3/0/8/130814346/pelopunitafejov.pdf
    • http://mauritskoelewijn.nl/uploads/1/3/0/7/130738998/kenexuwatatak.pdf
    • http://kittitascarshow.com/uploads/1/3/0/4/130436204/4b1bd440b3967fe.pdf
    • http://chris-thayer.com/uploads/1/3/0/6/130621353/telawumofuwixo.pdf
    • http://saludon.com/uploads/1/3/0/8/130814966/rofosuxomodewofugo.pdf
    • http://million-minds.org/uploads/1/3/0/6/130604666/nukalunon_xamimepometep_boxamegusud_jalonevasumeke.pdf
    • http://biding-my-time.com/uploads/1/3/0/3/130379408/lanutaforigeseped.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_off0000c890.bin
4b47173709b6aa1a91c7088b4132b7e0b3819fa714cac9c90a09a2be5fb8db2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 7784 bytes
font_01_sfnt_off0000e6a8.bin
4af23357d936647524c2e05bed92cf711a18fdd1a94df9bb6c1f0ed2a8a11948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 17692 bytes

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