PDF malware analysis — malicious · 809b8ee3891a5a2b

MALICIOUS

PDF

63.6 KB Created: 2020-06-12 12:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cc210c210fbf2052b2ac0a242d8db880 SHA-1: e1c10fd29348dfeff73de41b97e71c7cc136d292 SHA-256: 809b8ee3891a5a2b2d31417c069121c1e9314d8c2205b08efc0152f060fd0f52

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files. This technique is often used to manipulate search engine rankings or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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://cafe-heart.co.uk/uploads/1/3/0/3/130324072/130324072.html#%25D9%2583%25D9%258A%25D9%2581+%25D8%25AA%25D8%25B5%25D9%2586%25D8%25B9+%2522%25D8%25AA%25D8%25B4%25D9%2588%25D9%2584+%25D8%25A8%25D8%25A7%25D8%25AA%25D9%2588%25D8%25B1%2522+%25D9%2585%25D9%2586+%25D8%25AA%25D8%25A3%25D9%2584%25D9%258A%25D9%2581+%2528%25D9%2586%25D9%258A%25D8%25B4%25D8%25A7
- http://biofram.com/uploads/1/3/0/2/130271047/ee32446a.pdf
- http://mundomateriales.com/uploads/1/3/0/6/130604703/mobatidujiwa_wezojixewexow_zametunevevef.pdf
- http://74-123-77-45.mgwnet.com/uploads/1/3/0/7/130776082/a2177c.pdf
- http://querubicamp.com/uploads/1/3/0/4/130476887/gunifanoruko-mapunumigum-mexenara-zutinek.pdf
- http://marie-scott.com/uploads/1/3/0/8/130815080/7332335.pdf
- http://cpanel.speech4kidz.com/uploads/1/3/1/3/131398225/zumeka.pdf
- http://mplsocialservices.net/uploads/1/3/0/6/130621143/ff2b7cc82749337.pdf
- http://chloemartins.com/uploads/1/3/0/8/130874522/96c83f27.pdf
- https://wedikul.files.wordpress.com/2020/06/porezo.pdf
- https://zisosaxevesi99562676.files.wordpress.com/2020/06/memadarexuxo.pdf
- https://razekusokil.files.wordpress.com/2020/06/zudoradoselu.pdf
- https://momuniwidap.files.wordpress.com/2020/06/tovipa.pdf
- https://kovimaj.files.wordpress.com/2020/06/dimisituxobedo.pdf
- https://judesugitu.files.wordpress.com/2020/06/216543041.pdf
- https://suvirowom.files.wordpress.com/2020/06/77881788285.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.

Filename	Kind	Source	Size
`stream_003_off00009c8e.bin` `0ab76e0663b0c00f6ddee3496f539d1a1a3da65786696ea07e4763a68a4624cb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x9C8E	32544 bytes
`font_01_sfnt_off0000d49a.bin` `af3d98f4adaab41ad7bd60885005a9f91524a09da2d48499d9141e3cfebc67dd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD49A	9028 bytes

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