Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84303fae384a672…

MALICIOUS

PDF

39.5 KB Created: 2020-04-07 15:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27eaba4bb17eec1af683a643e9960596 SHA-1: 99817a6590fdd31452ee44f2418ea1208a8315c8 SHA-256: a84303fae384a672fa87db8d5851ad148d5818272c92f67827b536f23bd734c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the extensive link farm suggests a delivery mechanism for potentially harmful content.

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://afcidesign.com/uploads/1/3/0/7/130775012/130775012.html#que+es+gravilla+en+construccion
    • http://thehappystreak.com/uploads/1/3/1/4/131454620/8c8dc4af1a8c3.pdf
    • http://ctsretreat.com/uploads/1/3/1/0/131069978/furato_xufowikijavaka_kosedoxagas_gekisuveza.pdf
    • http://pafosterphotos.com/uploads/1/3/0/4/130483242/2087384.pdf
    • http://trainzulupeak.com/uploads/1/3/0/7/130775921/lerovemomowaxed.pdf
    • http://ontracbyreinke.com/uploads/1/3/0/4/130435711/269df637e2b1.pdf
    • http://6106829.xyz/uploads/1/3/1/4/131406798/vivibeduje.pdf
    • http://rulethewavesband.com/uploads/1/3/0/5/130551249/be17a7.pdf
    • http://realnursingrn.com/uploads/1/3/0/2/130287847/rodaboses-pidopu-gumenazezev-wuvoliwagomi.pdf
    • http://shelbeyhidman.com/uploads/1/3/0/3/130379676/72fff7b47a05.pdf
    • http://duzaingconstrucciones.com/uploads/1/3/0/2/130271051/5535866.pdf
    • http://onnabsscentedescapes.com/uploads/1/3/0/5/130590111/f3553268f50f.pdf
    • http://whatinternswear.com/uploads/1/3/0/6/130621243/mawigusotu.pdf
    • http://hybridhealth.ca/uploads/1/3/0/7/130775817/lefawidolal-tedadek-latidovopibelid-kepevitakixemuf.pdf
    • http://pikkuitalia.com/uploads/1/3/1/0/131071056/sosuwobobusirelerib.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070ab.bin
1b5a6f56653530d2c6216ade117994caddc74bcdb582b601c07c8c13de20abf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AB 8516 bytes

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