Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a58ed11cbf7cc1…

MALICIOUS

PDF

35.2 KB Created: 2020-04-14 07:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e28c3beb7045308e5bdec9ac714390f1 SHA-1: baf9fae41566c25d008c677c84994c1fd12b4d43 SHA-256: 78a58ed11cbf7cc16c22d7cd2de286206498cb8e2cb8b6ff3865fb5eed6e2af3
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are disguised as financial spreadsheets. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a link farm designed to direct users to potentially malicious content hosted on various domains.

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://stillwaterswellness.org/uploads/1/3/0/5/130544321/130544321.html#cash+flow+spreadsheet+for+small+business
    • http://acardon.com/uploads/1/3/0/7/130739001/suziwufiri.pdf
    • http://thriveandnourish.com/uploads/1/3/0/8/130813798/kabibatanojope.pdf
    • http://barndoordesigns.org/uploads/1/3/0/5/130544226/vevenirufi_mogibanurun_zixavupume_tifuzapedumomo.pdf
    • http://sendygiamatteipictures.com/uploads/1/3/0/3/130324440/maxitubakup.pdf
    • http://zilomha.com/uploads/1/3/1/3/131381693/sapowevusaxotuv.pdf
    • http://bexbot.com/uploads/1/3/1/4/131437864/5771859.pdf
    • http://fourcornercollectables.com/uploads/1/3/0/4/130476237/sosotegutiwor.pdf
    • http://flirtyandfunbowsagesbyjennym.com/uploads/1/3/0/4/130436182/72739.pdf
    • http://popculturecon.org/uploads/1/3/0/2/130287317/venik.pdf
    • http://solizagency.com/uploads/1/3/0/4/130483565/9682016.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_off0000612d.bin
2898449b5d4095e27ddabc52e0d5619261613d4d05f534f50c4f2a8df2303aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612D 7632 bytes

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