Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cb5b1d11f29e53…

MALICIOUS

PDF

47.6 KB Created: 2020-03-28 12:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36195cf0615cd78a2f57b42f6e66ebc7 SHA-1: 6db31ef54d9456ab78427cb5e33ff67ad6c6e707 SHA-256: 25cb5b1d11f29e5390ee592537229b09fb3113837892d42aa2be330e63ad392f
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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely serve as a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

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://indoorqualityaircody.com/uploads/1/3/0/7/130739416/130739416.html#integral+of+e%5Ex%281+x%29%2Fcos%5E2%28x+%5Ex%29
    • http://andreafarmeraprnllc.com/uploads/1/3/0/4/130435597/3fc3329a90c15c5.pdf
    • http://smc-cism.maryhigginswebdesign.com/uploads/1/3/0/3/130312925/jaliwa_tekuxojopudaz_wuvirato.pdf
    • http://saaqld.com/uploads/1/3/0/7/130740051/e3d962fa22f58.pdf
    • http://missionbeachcaravanpark.com/uploads/1/3/0/6/130639995/0de4e55bc7d6e1e.pdf
    • http://waynesvillegalleryassociationnc.com/uploads/1/3/0/9/130969048/5670944.pdf
    • http://rootsofyogatraining.com/uploads/1/3/0/4/130489763/kebik.pdf
    • http://mta-sts.cherylynsalon.com/uploads/1/3/0/6/130605355/lumapovutegusov.pdf
    • http://kcideal.com/uploads/1/3/0/4/130475992/8b7ce.pdf
    • http://mindbodyfit365.com/uploads/1/3/0/5/130588654/d09163c782.pdf
    • http://www.christinamphotography.studio/uploads/1/3/0/3/130323466/misiza.pdf
    • http://garenterprise.com/uploads/1/3/0/2/130272548/9709199.pdf
    • http://classiccitycapital.com/uploads/1/3/0/2/130288444/1878305.pdf
    • http://agentforwriters.com/uploads/1/3/0/6/130605167/7037364.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_off00008422.bin
8bdb05b3382e31ab7a8e3e9c79ae8639958a170e36cdc142c61386141e7e1aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 9184 bytes
font_01_sfnt_off0000a727.bin
b0b81acf99f867ec01b12aaa7df2cf8e0a204e4f33d939d80d206132c728d5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA727 2740 bytes

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