Malicious PDF — malware analysis report

Static analysis result for SHA-256 3019f4b411d5a6ee…

MALICIOUS

PDF

83.8 KB Created: 2020-04-04 07:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dffbf3e8fa754760987f3cd0acb33bab SHA-1: 31a9897ad98b288ecc2c299575b98f317b3030be SHA-256: 3019f4b411d5a6eeab48e51b36cf73e9d99d69ed08116486a39e33aa15f53f6c
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. The PDF_SEO_LINK_FARM heuristic firing confirms this behavior, indicating a mass of external PDF links. The ML classifier also strongly flagged this sample as malicious. The embedded URLs suggest a pattern of redirecting users to potentially harmful websites.

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://salvationproject.org/uploads/1/3/0/7/130775214/130775214.html#pearson%27s+chi+square+test+in+spss
    • http://mikelatt.com/uploads/1/3/1/0/131070173/2682939.pdf
    • http://alwaysglams.com/uploads/1/3/1/3/131398478/2435226.pdf
    • http://shuttersmyrtlebeach.com/uploads/1/3/0/4/130435682/8290595.pdf
    • http://myovisioninfo.com/uploads/1/3/0/6/130622000/xifufup_xelar_walisuzazejaj.pdf
    • http://structuraldamage.org/uploads/1/3/1/3/131378932/5622891.pdf
    • http://skiundmtbschule-bergnaufbergnaa.com/uploads/1/3/0/6/130640063/96214141b8c7e.pdf
    • http://newhavenmo.com/uploads/1/3/1/4/131437409/gofasipusuk.pdf
    • http://ipray4u-intl.org/uploads/1/3/0/4/130488946/nilux.pdf
    • http://samuelprovencher.net/uploads/1/3/0/6/130605498/seralujorizunaraji.pdf
    • http://informstamu.com/uploads/1/3/1/3/131380985/6515636.pdf
    • http://icdtautomotivellc.net/uploads/1/3/0/2/130289284/fojufedinom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fd.bin
978e52332c36755aa574809392b7a4e15649c4336c60ba087ace5463b194cf0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10424 bytes
font_01_sfnt_off00011cd6.bin
c334d4fd2f0119b00ca8118a2d17f4cb0af6ce5ab3c4a413d6571ae8a217cbfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD6 4176 bytes
font_02_sfnt_off00012b02.bin
229fe235744bcd77d2866fc0f5088e6f52e1903dfd4ba2f1548e92410d1a4494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 16308 bytes

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