Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b588a33342f9fc…

MALICIOUS

PDF

44.0 KB Created: 2020-03-23 15:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 178278a1df09dfce70aeb56d17745e49 SHA-1: 9477b0d30f6fc60659920bb5fbef2aae9777a862 SHA-256: 73b588a33342f9fcbb7f6dc6556697bc0329baed01b17d41f627616a19d55c77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. These links likely serve to manipulate search engine results or lead users to malicious content, potentially for phishing or malware distribution.

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://rainbowsandrainboots.org/uploads/1/3/0/6/130621312/130621312.html#until+command+in+unix+shell+script
    • http://paymentsourceint.com/uploads/1/3/0/5/130588289/e6636.pdf
    • http://airstreamflyingcloud19cb.net/uploads/1/3/0/8/130814021/d288ff551617.pdf
    • http://leanfitness.co/uploads/1/3/0/6/130621800/49c42c.pdf
    • http://amgrecords.com/uploads/1/3/0/6/130604563/guromuwazonatutefa.pdf
    • http://wildmedix.co.za/uploads/1/3/0/7/130775551/xifezade.pdf
    • http://digitaltechnologieswa.com/uploads/1/3/0/8/130874620/7903102.pdf
    • http://adaptiveplanningconsultant.com/uploads/1/3/0/6/130639073/f95af8bbfc.pdf
    • http://findyourconstant.com/uploads/1/3/0/6/130605125/xemegevug_saturemafewe.pdf
    • http://www.schanwriter.com/uploads/1/3/0/6/130603810/7058142.pdf
    • http://worldclasstitle.net/uploads/1/3/0/4/130488935/podikabaruv.pdf
    • http://thesustainablechurch.org/uploads/1/3/0/6/130639107/3685116.pdf
    • http://mta-sts.mail.kenyeung.org/uploads/1/3/0/6/130604515/bubawad_gagudubududo_vevexor_jemajokudix.pdf
    • http://amaris-studio-llc.com/uploads/1/3/0/6/130621545/2539780.pdf
    • http://ezobord.co/uploads/1/3/0/5/130550880/faraselenalojavo.pdf
    • http://neurosurgicalconsultations.com/uploads/1/3/0/2/130289508/xobinefikolonuj-zetusilapenoga.pdf
    • http://truedeflab.com/uploads/1/3/0/6/130639946/2c73f429.pdf
    • http://www.bulldogrestore.com/uploads/1/3/0/5/130588376/10a1d6bc38c5.pdf
    • http://smartliftvest.net/uploads/1/3/0/7/130739592/095d30685221.pdf
    • http://709-bonus.site/uploads/1/3/0/6/130604279/wokisoxemewoxitupu.pdf
    • http://thesituationshortfilm.com/uploads/1/3/0/9/130969993/4739931.pdf
    • http://guitarwhisperershop.com/uploads/1/3/0/3/130379051/0f88c1f2234e4c.pdf
    • http://newinvite.com/uploads/1/3/0/6/130604466/sijivipasabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007281.bin
2b61c39dccc4ab066eebd8cc00678a41c7fa0e68f88d5f637884af77fdbada16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7281 9560 bytes
font_01_sfnt_off000096c4.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C4 2732 bytes

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