Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f72711e02a1bfc…

MALICIOUS

PDF

42.4 KB Created: 2020-03-21 11:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6ca25ee1a9acd8bafd792c45f440041 SHA-1: bc86cae94a6f8c5f57a262dba8240e8558fcec32 SHA-256: 82f72711e02a1bfcfdf10bfcfad8057a6e491b2af12698672627e2aed758854a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely a link farm designed to manipulate search engine results or distribute malicious content. The embedded URLs, such as http://solengenharia.net/uploads/1/3/0/6/130639263/130639263.html#metastatic+bone+lesions+icd+10, suggest a lure related to medical information to entice users to click. No scripts were extracted, but the sheer volume of outbound links points to a distribution or redirection mechanism.

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://solengenharia.net/uploads/1/3/0/6/130639263/130639263.html#metastatic+bone+lesions+icd+10
    • http://avalonbeachpodiatry.com.au/uploads/1/3/0/5/130589124/56720dfa9.pdf
    • http://mk3basketballclinics.com/uploads/1/3/0/3/130323156/6d48451719a.pdf
    • http://godatwartheanswer.com/uploads/1/3/0/7/130738673/7f1c7aefcb97.pdf
    • http://diamondsuppliments.com/uploads/1/3/0/7/130739105/5880d3ab1.pdf
    • http://alishatodd.com/uploads/1/3/0/7/130739126/f3f15f4.pdf
    • http://rolloneyoubears.com/uploads/1/3/0/8/130813489/3670150.pdf
    • http://cafesationsg.com/uploads/1/3/0/5/130538990/madire.pdf
    • http://www.barrybbritton.com/uploads/1/3/0/6/130620635/vipiges.pdf
    • http://radius-new.thomasmore.be/uploads/1/3/0/5/130551423/maragof.pdf
    • http://mercedes.fit/uploads/1/3/0/3/130379741/1531036.pdf
    • http://andrewcecookephotography.ca/uploads/1/3/0/7/130776230/gigaviner_bekanimeba_rafavadudenalo.pdf
    • http://goodie2019.com/uploads/1/3/0/5/130551375/2260311.pdf
    • http://recruitertoolbar.com/uploads/1/3/0/5/130550754/kutifij-gipefig.pdf
    • http://mail.slascicarstvo-martina.com/uploads/1/3/0/8/130813644/deb18b436de51d.pdf
    • http://unrepentantfoodie.com/uploads/1/3/0/6/130603704/xorigapavu.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_off00007f28.bin
a3b424d51fb960064ce0e23ca35981aeb67d89c52f82b0618fc2f0ae3cffe542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F28 7444 bytes

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