Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29dc23125ed5387…

MALICIOUS

PDF

40.2 KB Created: 2020-03-23 03:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0663bc2f13db820e0ba41174028f04d4 SHA-1: 6b28c517076b9b2414c601a249f4530dc8b0cdc3 SHA-256: c29dc23125ed53878443cc452cdbff3c7c0110f769b4deca80af7cc1c549f00a
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://pearlseattle.com/uploads/1/3/0/5/130539319/130539319.html#jack+reacher+book+series+amazon
    • http://euniquemedicalsupplies.com/uploads/1/3/0/5/130589031/nepexa.pdf
    • http://middlesexpainters.com/uploads/1/3/0/4/130488688/bojenikavudido.pdf
    • http://seedhybridchecker.com/uploads/1/3/0/6/130621205/9c8b4573.pdf
    • http://whm.iowadetail.com/uploads/1/3/0/6/130639951/5289996.pdf
    • http://manorbedandbreakfast.com/uploads/1/3/0/2/130289341/worikof.pdf
    • http://feedds.org/uploads/1/3/0/5/130589433/4a77fbab9.pdf
    • http://snbpropertysolutions.com/uploads/1/3/0/2/130273571/puzoleluveke_nujuz_sozunaretiniko.pdf
    • http://sightseethecity.com/uploads/1/3/0/6/130621579/4413721.pdf
    • http://jointherescue.net/uploads/1/3/0/4/130475959/dewopow-kexototus.pdf
    • http://brennernixon.com/uploads/1/3/0/2/130287542/d30374a76154d89.pdf
    • http://joshuasummer.com/uploads/1/3/0/6/130621106/wenejupatu.pdf
    • http://tlcbookkeeping.org/uploads/1/3/0/7/130775822/e4a9e7529fff.pdf
    • http://www.kevina.com/uploads/1/3/0/9/130969701/a2df2f87069c.pdf
    • http://greecejapan.net/uploads/1/3/0/6/130605118/ce17d78.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_off0000753c.bin
9db379025a0f3218b484b23b9fa473ee2af2d6148897da37daa542be063b4388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 7856 bytes

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