Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bfa19e7a445da6…

MALICIOUS

PDF

36.3 KB Created: 2020-03-11 14:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bbaf173f3413345bc45b3d130d1f35af SHA-1: 2786c9b715550584e92ff0ea96fab4dca750da89 SHA-256: 21bfa19e7a445da6a92364173062fea8fa5657b9abe2fafcb5fc460730be35e1
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm technique. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

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://horace-the-big.pleasingfood.com/uploads/1/3/0/4/130476981/130476981.html#english+to+hindi+translate+java+app+download
    • http://naturopathsinternational.org/uploads/1/3/0/7/130776898/300741.pdf
    • http://www.nicholasjozaites.com/uploads/1/3/0/2/130270833/nonudeveluvodi.pdf
    • http://trainingcenterchurches.com/uploads/1/3/0/4/130483147/nefewumifixajir_jexuvenobose_vovasuxinugozus_wibikegegum.pdf
    • http://thehelpnepalappeal.com/uploads/1/3/0/7/130738625/84d598195c8.pdf
    • http://etherealphotographytn.com/uploads/1/3/0/7/130776157/4439769.pdf
    • http://neilfoxhealthandfitness.com/uploads/1/3/0/3/130313038/gaxetobibus-nerozotiwitovaw.pdf
    • http://dalal.la/uploads/1/3/0/7/130738789/xojijomo-bawemebe-nititerulu-dobuwu.pdf
    • http://moneypain.com/uploads/1/3/0/8/130813489/66899355f984d.pdf
    • http://mta-sts.backinactionchiropractic.com/uploads/1/3/0/8/130813997/dimejurepidodiz_luwivixokadeg_litoxoxir.pdf
    • http://hostmaster.surgicaltrainingnetwork.org/uploads/1/3/0/5/130589083/8608433.pdf
    • http://scottrosenthalphoto.com/uploads/1/3/0/6/130604801/xekumoleguxu_lufidemet_gotorumutemofag.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_off00006609.bin
aca387422b75a670c9503259c36e19f61cf0b54a62f83c0203a045bc7b552c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 7720 bytes

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