Malicious PDF — malware analysis report

Static analysis result for SHA-256 91293a2820b17008…

MALICIOUS

PDF

42.5 KB Created: 2020-04-02 04:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db512f61df9690a791769821eb978f22 SHA-1: 69cafdc961ccbfc0189fe40edde2a14c27413078 SHA-256: 91293a2820b170084107d2f33fb7135a5e86c5cce3879cd9787f954ff678e2b4
94 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to a large number of other PDF files hosted across various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a network of linked content, likely for SEO manipulation or to host malicious payloads. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body contains garbled text and embedded URLs, reinforcing the link farm attack pattern.

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://myytr.net/uploads/1/3/0/4/130436239/130436239.html#tama%C3%B1o+de+aguja+para+extraer+sangre
    • http://grwim.com/uploads/1/3/0/2/130287456/zovilijikanokaxolejo.pdf
    • http://jdbevents.org/uploads/1/3/0/9/130969037/2142480.pdf
    • http://valgetuvi.ee/uploads/1/3/0/2/130270831/1234146.pdf
    • http://campfirecomplete.org/uploads/1/3/0/5/130590548/vuterosu_nazasedewiser_nevezado_xizejabimixa.pdf
    • http://bellavitaphotobooths.com/uploads/1/3/0/3/130323220/nufulofefilifef.pdf
    • http://sl-interiorarts.com/uploads/1/3/0/9/130969750/bowasap.pdf
    • http://philadelphiacommercialpainting.com/uploads/1/3/0/4/130483770/1426799.pdf
    • http://summitbrainandspine.net/uploads/1/3/0/7/130739263/2c2fc2d79f82b.pdf
    • http://growincolumbus.com/uploads/1/3/0/2/130288554/dudosifese.pdf
    • http://ccflcog.org/uploads/1/3/0/6/130620789/4cfa4c5cc.pdf
    • http://ancient-hearts.com/uploads/1/3/0/2/130271237/1661f003606f8.pdf
    • http://spaghettihandprints.com/uploads/1/3/0/3/130379132/96030a.pdf
    • http://pineapplehomestudios.com/uploads/1/3/0/7/130739027/wosada.pdf
    • http://sasfoundation.us/uploads/1/3/0/6/130605472/tifopu.pdf
    • http://cosimacabrera.com/uploads/1/3/0/2/130288412/831ab2ad0d3ee.pdf
    • http://welovenathanbrightbill.com/uploads/1/3/0/3/130379336/4483064.pdf
    • http://27thtankbattalion.com/uploads/1/3/0/8/130814060/1533386.pdf
    • http://jamtech.solutions/uploads/1/3/0/5/130588721/7b63ecd50ae49.pdf
    • http://penseldrag.com/uploads/1/3/0/9/130969281/luzizirofi.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_off00006ddf.bin
3c3bbee71426acab9fefcdf53a96c7de2b700848939f50d868e7dd9b8076d781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDF 8624 bytes
font_01_sfnt_off00008d0b.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 4144 bytes

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