Malicious PDF — malware analysis report

Static analysis result for SHA-256 039cda537a8de437…

MALICIOUS

PDF

44.2 KB Created: 2020-03-08 12:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b8281deb7a84c0a6812e4105c92e0587 SHA-1: 2723e894ae8118a9f88022db2e93320775159c29 SHA-256: 039cda537a8de437d2f1fad69eacf0e31bdd3aa0d3ba1fdf8eb74f8900ee938f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO poisoning attack, designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://tartelaine.com/uploads/1/3/0/3/130379252/130379252.html#salary+for+aflac+benefits+advisor
    • http://thereserveatgoldhills.com/uploads/1/3/0/6/130603989/4590351.pdf
    • http://alphahealthandfitness.net/uploads/1/3/0/5/130588289/kasesoser_xozuz_tanuboboz_vevejejobojadu.pdf
    • http://ironwoodscience.com/uploads/1/3/0/5/130546415/522559.pdf
    • http://ldhbuyshomes.com/uploads/1/3/0/5/130551188/c9289.pdf
    • http://www.monumentvalleyhorsetours.com/uploads/1/3/0/6/130604177/nitazana.pdf
    • http://hostmaster.delissimobuntingford.co.uk/uploads/1/3/0/6/130621355/9f778e4eeea4.pdf
    • http://wabashtees.com/uploads/1/3/0/5/130588497/180a59.pdf
    • http://zhongluli.com/uploads/1/3/0/6/130604952/1a480b3f408.pdf
    • http://www.parkercarpentrydesigns.com/uploads/1/3/0/5/130588762/zonexoxofevaz.pdf
    • http://myleegen.com/uploads/1/3/0/2/130287871/bufora.pdf
    • http://citadelhomeservices.ca/uploads/1/3/0/4/130435821/1525d.pdf
    • http://lorilearnardart.com/uploads/1/3/0/6/130639978/toperebuwiw_gofidefowudotaw_panizunul.pdf
    • http://tuktukauto.co.za/uploads/1/3/0/4/130435743/573529.pdf
    • http://www.carderoclothing.ca/uploads/1/3/0/3/130379488/4276706.pdf
    • http://brittanisinclair.pink/uploads/1/3/0/5/130550961/4d31dd.pdf
    • http://millionairemomasia.com/uploads/1/3/0/5/130539370/42813b6.pdf
    • http://summer-maths-activities-challenge.com/uploads/1/3/0/5/130538990/wosalodojovel-ganekumesekelam.pdf
    • http://oakalleydesigns.com/uploads/1/3/0/4/130435960/fugif.pdf
    • http://mrsparsons.net/uploads/1/3/0/7/130775180/zuzadisamuvemufad.pdf
    • http://geekmeetssocial.com/uploads/1/3/0/4/130488619/jejoxozasiga_liwela_ragosenewokelax.pdf
    • http://achievemediation.com/uploads/1/3/0/2/130274024/gibaxavowa.pdf
    • http://microbubblemaker.com/uploads/1/3/0/3/130323461/442bc0ba.pdf
    • http://opfor.us/uploads/1/3/0/7/130739732/347540cd.pdf
    • http://freespiritleisure.online/uploads/1/3/0/6/130639477/leburagamukosamuruze.pdf
    • http://todorovtruffles.com/uploads/1/3/0/6/130639192/kezejejafizolit-rositil.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_off000080ad.bin
9e1cac1c1368e2d7dc28b97ed6dd982f867cbd72fb6fb20c02121de046e7e501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AD 8968 bytes

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