Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bdc5d9f61fd7c6…

MALICIOUS

PDF

45.9 KB Created: 2020-04-14 02:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35188e89e5bf700bfdfb357a2e36619d SHA-1: 4b3a1ed585c128efd3ff02181c5a32b81b0fb098 SHA-256: 91bdc5d9f61fd7c6f2174e57b4adfd7e26122e80b7e64bc3508a4d5a54a24ef1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains, indicating a link farm or redirection scheme. The document body text, though partially obfuscated, includes a URL that appears to be a lure for 'formal prom dress stores near me'. This suggests the primary goal is to redirect users to malicious sites, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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://theomicrononline.com/uploads/1/3/0/5/130590511/130590511.html#formal+prom+dress+stores+near+me
    • http://awa-designs.com/uploads/1/3/0/7/130775735/2600865.pdf
    • http://apkpatch.org/uploads/1/3/0/6/130604382/foravemur.pdf
    • http://aliceinburgerland.com/uploads/1/3/0/2/130289581/1737a3ec0dd9ba2.pdf
    • http://larsonmediation.com/uploads/1/3/1/4/131437978/6272086.pdf
    • http://outdoorsolutionsusa.org/uploads/1/3/0/3/130313590/e6bab55d87fa9e7.pdf
    • http://montessorilawrence.org/uploads/1/3/0/9/130969054/zunarejitigu.pdf
    • http://nachintu.com/uploads/1/3/0/2/130270747/90a06abafffa140.pdf
    • http://solsaic.ca/uploads/1/3/0/8/130815437/95759c9e63f.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_off000072c9.bin
ea70c945613c41d646f6b84fb0c4f63bd8cdcd4f8bb90545d06a7111d26a8ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C9 8984 bytes
font_01_sfnt_off000094ea.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 16036 bytes

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