Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9aeb389ba3c3ba…

MALICIOUS

PDF

35.0 KB Created: 2020-05-15 18:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11fb7de0c0028811884a55fea878b5ac SHA-1: b21a6c0916107e8bc375becfe34e7e2eeb0ea779 SHA-256: af9aeb389ba3c3ba01e73e8dbefb404f8c1efea4882e4b7a72553deecb3f26f4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially obfuscated, contains URLs that are part of this link farm. The primary purpose appears to be directing users to a network of potentially malicious or spam-related content.

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://ecsfrushionwheels.com/uploads/1/3/1/4/131406827/131406827.html#odia+bhajan++karna+hai
    • http://metallicblackrecords.com/uploads/1/3/1/6/131637279/fef579.pdf
    • http://arredoinvetro.com/uploads/1/3/0/6/130620185/06e0d39fed85f3b.pdf
    • http://jouettlaw.com/uploads/1/3/1/3/131380493/zodire_vigima.pdf
    • http://challengetheshield.com/uploads/1/3/0/6/130621216/7006822.pdf
    • http://jenniferlouisebeauty.com/uploads/1/3/0/4/130476492/nibefixikalug.pdf
    • http://getfitchef.com/uploads/1/3/1/0/131070080/c4ba6158cdd4683.pdf
    • http://microbladinghtx.com/uploads/1/3/0/6/130604249/451960e2de.pdf
    • http://alysepruett.com/uploads/1/3/0/3/130313247/1117254.pdf
    • http://vietteldongnai.net/uploads/1/3/0/2/130270761/7024154.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_off00005d9e.bin
b5c688819f614a590fd68217afd88e8545af3b1f623779861e29ca5d9a2042d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9E 10448 bytes

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