Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad89cb4afa33775c…

MALICIOUS

PDF

40.6 KB Created: 2020-04-07 04:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ceb9666317d3b4e2898aa6decdbef5e4 SHA-1: 469a835f31df649acb98c3860bf2d67ddf9112fd SHA-256: ad89cb4afa33775c8e56acc8e97aafa76ecbccb9badc54eb4179522caaf1101b
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though partially corrupted, contains a URL that mirrors one of the extracted external links, suggesting a deliberate attempt to direct 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://chunkeymonkey40.com/uploads/1/3/1/3/131379945/131379945.html#como+hacer+un+trabajo+escrito+en+word+con+normas+apa
    • http://strengthandhonor.online/uploads/1/3/0/6/130604582/388b94be4128.pdf
    • http://yardsaleseveryday.com/uploads/1/3/1/3/131398324/walekekow.pdf
    • http://ofcpineapplepoker.com/uploads/1/3/0/2/130270872/7600260.pdf
    • http://hutmuseum-nuernberg.de/uploads/1/3/0/2/130288488/9575080.pdf
    • http://morningsunshinebath.com/uploads/1/3/1/4/131455275/5229355.pdf
    • http://beverlywilshire.org/uploads/1/3/1/3/131382257/5633534.pdf
    • http://a4-com.com/uploads/1/3/1/3/131379948/simojojibavegit_sibotux.pdf
    • http://melbournefoundationrepair.com/uploads/1/3/0/9/130969991/9179949.pdf
    • http://brhrealestatemarketing.com/uploads/1/3/1/4/131406668/92c9e40fc3cfb50.pdf
    • http://loftreviews.net/uploads/1/3/0/3/130380084/138ca32b36.pdf
    • http://biodanzadanmark.dk/uploads/1/3/0/7/130776819/71528582f.pdf
    • http://connorjouppi.com/uploads/1/3/0/4/130490399/motazotaxawugidag.pdf
    • http://bigbsbarandgrill.com/uploads/1/3/0/4/130483509/1033620.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_off00007623.bin
74d90927e8f27ad17e018416cd71c81874bfbbf5b0cd6d13109bc5e4bd3fe8ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7623 8432 bytes

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