Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9b634f3f4c5326…

MALICIOUS

PDF

54.2 KB Created: 2020-06-05 15:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 387eca38ef3b9fc66d212cc74716264e SHA-1: f6cddc37fa1e91c146c5184642330e12df720937 SHA-256: af9b634f3f4c5326a99c5f0a5489202ca6f2e616ec9f2a0b6a1b7329a77cc75b
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, indicating it is part of a link farm or SEO scam. The document body, though partially corrupted, contains text suggesting it is related to 'practice tests', which is likely a lure to entice users to click on the embedded URLs. The primary purpose appears to be directing users to a network of websites, potentially for malicious redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://a-1environmentalservices.net/uploads/1/3/1/0/131070202/131070202.html#advanced+practice+tests+plus+2+audio+chomikuj
    • http://insideoutalive.com/uploads/1/3/1/4/131437094/wekifumulepez.pdf
    • http://sigman-mills.com/uploads/1/3/0/5/130538953/94294807.pdf
    • http://sagebrushcountryllc.com/uploads/1/3/0/6/130621455/wawakoje.pdf
    • http://tiastokes.com/uploads/1/3/0/6/130621325/5b97173.pdf
    • http://ftlbristol.com/uploads/1/3/0/6/130621531/448c571a69b0e15.pdf
    • http://lakesendsteam.com/uploads/1/3/0/8/130874021/sozoluzij.pdf
    • http://a-1environmentalservices.net/uploads/1/3/1/0/131070202/terms.html
    • http://a-1environmentalservices.net/uploads/1/3/1/0/131070202/dmca.html
    • http://a-1environmentalservices.net/uploads/1/3/1/0/131070202/policy.html
    • https://pimikineli.files.wordpress.com/2020/06/lisabafidelupomeponexux.pdf
    • https://gopetimumes.files.wordpress.com/2020/06/neweguwijiregedom.pdf
    • https://dusinezogene.files.wordpress.com/2020/06/jetuvodogo.pdf
    • https://zagetotixuwa.files.wordpress.com/2020/06/kikirabitosezazewanovuga.pdf
    • https://xodixumavin.files.wordpress.com/2020/06/rekit.pdf
    • https://jowewaliki.files.wordpress.com/2020/06/18222781171.pdf
    • https://bapojeva.files.wordpress.com/2020/06/kamebiketi.pdf
    • https://gokidomaj.files.wordpress.com/2020/06/37996398852.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096ee.bin
0b90b97b5a70b698d61072bfd022997d5740c2c9be17dd70de7bdb12b16237bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EE 16940 bytes

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