Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b65b5fea3717a31…

MALICIOUS

PDF

50.1 KB Created: 2020-04-13 13:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 73a004cd404d76511bddf3314bc86db2 SHA-1: 0af1912282169ba449a6dbf32b8dc0955cc05aac SHA-256: 7b65b5fea3717a311f578a99556b61d87203ba2774158b092d32512040dcdab7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous links, suggesting an attempt to manipulate search engine rankings or redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of outbound links is suspicious.

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://fightingtheory.com/uploads/1/3/1/4/131438898/131438898.html#como+poner+un+asterisco+en+el+teclado
    • http://reachchurchkc.com/uploads/1/3/0/6/130605448/abefe64.pdf
    • http://brucegarrabrandt.com/uploads/1/3/0/6/130604162/wekorubo.pdf
    • http://pain-reliefchiro.com/uploads/1/3/0/3/130313123/04334c9d9fd7.pdf
    • http://legacyinwords.com/uploads/1/3/1/3/131398487/tulabemugoj.pdf
    • http://slateco5.com/uploads/1/3/0/6/130639811/fukazige-liwawafipumise-xoxevan-kezusazu.pdf
    • http://skinworkx.com/uploads/1/3/0/8/130874347/6072485.pdf
    • http://migrainenaturalhealing.com/uploads/1/3/1/3/131383204/7272643.pdf
    • http://meyersmanhattanparking.com/uploads/1/3/0/5/130588708/bbebaf5.pdf
    • http://kristyhalderman.com/uploads/1/3/1/6/131606370/9afd4a9cdf3c.pdf
    • http://pic-performance.com/uploads/1/3/0/7/130776325/zilerelewud.pdf
    • http://jgcsalesclinic.com/uploads/1/3/0/2/130271103/lurigefixesib.pdf
    • http://nightingaleicecreamsandwiches.com/uploads/1/3/1/4/131483108/d21d32053d34d38.pdf
    • http://myrole.finance/uploads/1/3/0/8/130814311/rilel.pdf
    • http://jiwonmoonart.com/uploads/1/3/1/1/131163772/8231546.pdf
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/Copyright
    • http://www.typoland.com/
    • 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/
    • http://scripts.sil.org/OFL
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067c7.bin
de6aacb5a55f55b98bf3ae384f96a51051c900e5a59c241f5198d539ce1a3af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C7 6168 bytes
font_01_sfnt_off0000772b.bin
833400bf51de96b04ddce81f5d8985a0cd22226aadb18afc79ea5502bad55838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772B 8512 bytes
font_02_sfnt_off00009618.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9618 4144 bytes
font_03_sfnt_off0000a30d.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA30D 16312 bytes

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