Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b830ebb0560a9c…

MALICIOUS

PDF

37.4 KB Created: 2020-06-02 19:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375b78e2c4ab6405eecd35ad5f196398 SHA-1: a0ac516c01e37443e3297b97abb3e22cd1cd733a SHA-256: d0b830ebb0560a9c8297d5013448295ba5b7fbfc10b7e1989ecca89912785d2b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to movie content, suggesting a lure to attract users. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://hbade.org/uploads/1/3/0/7/130776674/130776674.html#transformers+4+full+movie+in+hindi+7
    • http://burlingtonprocessservers.com/uploads/1/3/0/4/130483745/3247204.pdf
    • http://barbaraharbach.com.barbaraharbach.com/uploads/1/3/0/2/130274097/fawetaj.pdf
    • http://aynk.org/uploads/1/3/0/3/130313610/xalorujugafirefefawu.pdf
    • http://wingsofhealing.global/uploads/1/3/0/4/130490019/566358.pdf
    • http://1bp.undesirable.us/uploads/1/3/1/4/131408170/bidul.pdf
    • http://hbade.org/uploads/1/3/0/7/130776674/terms.html
    • http://hbade.org/uploads/1/3/0/7/130776674/dmca.html
    • http://hbade.org/uploads/1/3/0/7/130776674/policy.html
    • https://wumudatimi.files.wordpress.com/2020/05/50956675028.pdf
    • https://zizumukufapa.files.wordpress.com/2020/05/63870930640.pdf
    • https://buwivimew.files.wordpress.com/2020/05/fokorukeviwulerogarugurut.pdf
    • https://dozoreka.files.wordpress.com/2020/06/75630055090.pdf
    • https://vobenixabew.files.wordpress.com/2020/05/77643362290.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_off00005c13.bin
0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C13 1728 bytes
font_01_sfnt_off000064aa.bin
a51c6c216a5d8c814c9c75c293af7e2dadc697c579e2607213922bdebb76bdb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AA 10640 bytes

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