Malicious PDF — malware analysis report

Static analysis result for SHA-256 f532d27c96dc0321…

MALICIOUS

PDF

38.3 KB Created: 2020-03-12 08:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c7ca03b748d1f8b57e5db5e9c7afed36 SHA-1: 3b05e9d4b623837ed1a5643f49ad28a4bdeb284a SHA-256: f532d27c96dc03215ec9c99832765840c72e7d239c5b53f58ee78850a2a69469
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to a medical procedure and numerous URLs pointing to various domains, suggesting a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, and the sheer volume of external links points towards a malicious intent, possibly to distribute further malware or engage in phishing.

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://kathleen-cortez.pleasingfood.com/uploads/1/3/0/7/130738679/130738679.html#pleural+effusion+tap+procedure
    • http://bebrave.studio/uploads/1/3/0/5/130539165/f4672e9afc.pdf
    • http://www.sparkacademygeorgia.com/uploads/1/3/0/6/130604672/ee822.pdf
    • http://cheaptokeeptreesandlandscapes.org/uploads/1/3/0/6/130639801/7292d5ddb38.pdf
    • http://mingocarecbd.com/uploads/1/3/0/7/130775107/2914df.pdf
    • http://industrialagewelding.com/uploads/1/3/0/4/130490808/940295.pdf
    • http://craigbarrows.com/uploads/1/3/0/5/130550764/zelevidetuve.pdf
    • http://cristopherblake.com/uploads/1/3/0/4/130476346/4500315.pdf
    • http://jimmyplease.com/uploads/1/3/0/3/130323597/7534249.pdf
    • http://sextoys121.com/uploads/1/3/0/7/130776645/0720ada3438.pdf
    • http://mychosen.org/uploads/1/3/1/1/131163980/lunumeledomo.pdf
    • http://mokcorp.com/uploads/1/3/0/8/130813740/xixusam.pdf
    • http://www.krowncues.com/uploads/1/3/0/2/130288320/folupavomitotup-dedovadoxawexu-linasoxisasobof.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_off00006c93.bin
d56dc038c6dc559b7fe96a3c8648906753937d168faecf29db4680b49ce2ab66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C93 8388 bytes

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