Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd83c16cd657cbb…

MALICIOUS

PDF

40.9 KB Created: 2020-06-17 03:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2b46ba47e23ace42d76cd01cea7d6e SHA-1: 617e94197a68fb7088c03552d064610d63490ae7 SHA-256: ebd83c16cd657cbbf002c0afccb48a9b80559d34e008a38efaa1dc2b09b61a56
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on suspicious domains, suggesting a link farm designed to distribute malware. The document body, though partially corrupted, contains text related to 'Discrete mathematics dossey 5th edition pdf', indicating a lure to entice users to click on the malicious links. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://3t3.undesirable.us/uploads/1/3/1/4/131437502/131437502.html#discrete+mathematics+dossey+5th+edition+pdf
    • http://iregretit.org/uploads/1/3/1/3/131398149/fivazolunosoxuzudik.pdf
    • http://virginisu.com/uploads/1/3/0/8/130813643/pijugotofunepax.pdf
    • http://theglobeclothingcompany.com/uploads/1/3/0/6/130603861/bobesudi_surixep_luxin.pdf
    • http://lyckhemgard.com/uploads/1/3/0/7/130776481/newapowa.pdf
    • http://hostmaster.kidwellybowls.com/uploads/1/3/0/6/130604312/9234830.pdf
    • http://hypnotherapy.uk.net/uploads/1/3/0/7/130776817/kaniraloweripu-bawawozidevibus-pasiwodiba-zoxitebulamaf.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_off00006152.bin
1097d88679e71eacfb5ef3fac6c2509e79676e6de975975b3d98766fc5b2b3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5376 bytes
font_01_sfnt_off0000737a.bin
d7e0334a25bffbf6f567fd721553e71202c9949f0f0454a3c41fab7187e15e66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737A 10580 bytes

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