Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ea735ba01559c4…

MALICIOUS

PDF

38.1 KB Created: 2020-03-08 02:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c1b379c70049993e003c5dce2a4634f SHA-1: c1ab2572f876d7ded10d4069a1a512c930f923f1 SHA-256: d5ea735ba01559c4d0e0d9b214b7f1ec12cf4d286ab88d8517080e61c1270b9f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a link farm designed to redirect users to potentially harmful 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://74-123-73-235.mgwnet.com/uploads/1/3/0/7/130776826/130776826.html#exercise+present+perfect+simple+and+present+perfect+continuous
    • http://annahighcountry.com/uploads/1/3/0/3/130379294/xajinebaf-vadadejup-bigarakut.pdf
    • http://mta-sts.grandcountyems.com/uploads/1/3/0/4/130475982/darewidanujaviv.pdf
    • http://halpernproject.com/uploads/1/3/0/4/130488700/somibi.pdf
    • http://assistancedogassociation.org/uploads/1/3/0/3/130323253/5114833.pdf
    • http://hostmaster.prettylines.com/uploads/1/3/0/7/130776308/3acba885231.pdf
    • http://inboundtrain.org/uploads/1/3/0/6/130640020/jivofomunujo.pdf
    • http://mikepaganrealtor.com/uploads/1/3/0/8/130813135/nosijogisakona-pevuju.pdf
    • http://vanessarusso.com/uploads/1/3/0/2/130272260/1910359.pdf
    • http://mindhealthconnection.org/uploads/1/3/0/2/130291523/rawad.pdf
    • http://bearsvbabies.org/uploads/1/3/0/7/130738962/45ca58eaf225.pdf
    • http://www.distancelearning-today.net/uploads/1/3/0/5/130539990/6643713.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_off00006404.bin
52d02187af362ac738d1feeddf9d2708b68346183fafe2886d7c8454fad61299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6404 7408 bytes
font_01_sfnt_off00008167.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8167 2604 bytes

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