Malicious PDF — malware analysis report

Static analysis result for SHA-256 59cfe27fe8797431…

MALICIOUS

PDF

49.9 KB Created: 2020-03-20 04:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 320779b4e14d60afac1bbd6b71398b11 SHA-1: 800efb007c6088c27f243c6287bee52dd930aa3e SHA-256: 59cfe27fe87974311a2c9d232d5e579b2a91fd536ba53397cffcc2e85c829db7
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam campaign. The document body, though partially corrupted, contains text related to hard drive speeds, likely a lure to attract clicks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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://mhrandlenovels.com/uploads/1/3/0/9/130969926/130969926.html#velocidad+lectura+y+escritura+disco+duro
    • http://erinkaith.com/uploads/1/3/0/8/130813945/vogupobopuwul-xijutidaxun-tupiwegosijimax-pimotudadupuk.pdf
    • http://multilanguagebox.com/uploads/1/3/0/6/130603948/527432.pdf
    • http://pasturepride.com/uploads/1/3/0/7/130739398/winaratuxifuruw-gubegogovuda.pdf
    • http://onlinecareerjob.com/uploads/1/3/0/5/130588651/norotu.pdf
    • http://www.eastbournecandybar.co.uk/uploads/1/3/0/6/130603894/belepewe.pdf
    • http://hostmaster.thetrainingcentre.org/uploads/1/3/0/6/130604863/211734.pdf
    • http://craftyladycrushingcancer.com/uploads/1/3/0/6/130621337/melabumed.pdf
    • http://mta-sts.mx.lucioconstructioninc.com/uploads/1/3/0/6/130603690/sutowegunor.pdf
    • http://fullandmerry.com/uploads/1/3/0/5/130547024/9427fa5.pdf
    • http://patrickhenrycapital.com/uploads/1/3/0/5/130545189/lufud.pdf
    • http://renegadegreens.com/uploads/1/3/0/3/130379435/1077395.pdf
    • http://everythingconcretehsv.com/uploads/1/3/0/8/130813764/446138.pdf
    • http://gamertraininginstitute.com/uploads/1/3/0/6/130639454/fabanakok_xemekakido.pdf
    • http://amudyomi.net/uploads/1/3/0/2/130287930/7221907.pdf
    • http://31belviderestreet.com/uploads/1/3/0/6/130604539/8656172.pdf
    • http://hostmaster.duckinn.co.uk/uploads/1/3/0/4/130483886/fesud.pdf
    • http://seasonsofla.org/uploads/1/3/0/8/130873983/bitojekozerudaxo.pdf
    • http://www.lmcinvest.com/uploads/1/3/0/7/130775605/c4e9f471d7dd3f2.pdf
    • http://www.amuttslife.com/uploads/1/3/0/3/130323407/7806891.pdf
    • http://kellystevensonceramics.com/uploads/1/3/0/6/130621554/229207.pdf
    • http://jpdickerson.net/uploads/1/3/0/2/130270980/7302674.pdf
    • http://mrdbmitchell.com/uploads/1/3/0/4/130488506/e3c28d39460.pdf
    • http://lemonadedivorce.net/uploads/1/3/0/2/130289763/76bac225e.pdf
    • http://bmcomput.com/uploads/1/3/0/5/130543141/guxafunimuxopajiv.pdf
    • http://bmcomput.com/uploads/1/3/0/5/130543141/
    • 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_off0000967d.bin
7055752e295ffa49e9bfe1145a652db1fd62ce90ec41b09165f4bfb333b4215a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967D 9192 bytes

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