Malicious PDF — malware analysis report

Static analysis result for SHA-256 64be7c33844a5a08…

MALICIOUS

PDF

53.4 KB Created: 2020-03-18 06:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7e45453a204b65eae4383dd9e7721fca SHA-1: 6a2132c98ca59373a5890da5c296846bdbe9ca92 SHA-256: 64be7c33844a5a08e7c9e5b8ef40993b1c102ec0e4fbf52f8c3874ffad5a2ae2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to drive traffic or potentially distribute further malicious 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://moccasinchildren.org/uploads/1/3/1/1/131163854/131163854.html#definicion+de+sentido+de+vida+segun+autores
    • http://juncotrade.com/uploads/1/3/0/5/130589420/2a5adab9c4e60c.pdf
    • http://cruisencocktails.com/uploads/1/3/0/5/130550663/lavevivuzetatovoxik.pdf
    • http://summervillepsych.com/uploads/1/3/0/3/130313161/2570392.pdf
    • http://themovingconcierge.com.au/uploads/1/3/0/5/130543976/kaxidupatel.pdf
    • http://differentnotdeficient.com/uploads/1/3/0/2/130272356/8901127.pdf
    • http://www.lf-ant.com/uploads/1/3/0/4/130483207/0cb87.pdf
    • http://hochzeitsaugenblick.com/uploads/1/3/0/9/130969806/wododade.pdf
    • http://galenetics.com/uploads/1/3/0/6/130621352/vovib-tolip-kikekizedoraw-luses.pdf
    • http://aroundtheworldtravelcenter.com/uploads/1/3/0/6/130620961/4399459.pdf
    • http://rosepalmerlaw.com/uploads/1/3/0/5/130590054/6862722.pdf
    • http://kaiauluconnectors.com/uploads/1/3/0/6/130620701/norumafax.pdf
    • http://idealcleaning.org/uploads/1/3/0/3/130323100/ca484529f2113.pdf
    • http://luchalibrevive.com/uploads/1/3/0/2/130289354/874885.pdf
    • http://decentralizedcoin.org/uploads/1/3/0/2/130289063/jusivesomidanorufalo.pdf
    • http://ilkayakbay.com/uploads/1/3/0/6/130604025/7877313.pdf
    • http://www.tonysconstructioninc.com/uploads/1/3/0/4/130435658/36691.pdf
    • http://floodexpress.com/uploads/1/3/0/7/130776672/5161928.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091f4.bin
1bb1d59b66c4ffcc8c72452147c0ef6f9efd217cb783e1f3b15cfbe0ad50665b
pdf-font-stream PDF embedded font (sfnt) at offset 0x91F4 8604 bytes
font_01_sfnt_off0000b125.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 16036 bytes