Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8d2c4b94aea3aa…

MALICIOUS

PDF

38.6 KB Created: 2020-04-20 05:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a45e77490fde17a8d858967ea1023dd7 SHA-1: 9c76140835a873ebddb8796b9c2361c0e5bb3ccc SHA-256: 5d8d2c4b94aea3aa59d65d9066591c5d01874c54d6b5b497aec1c1b1c52cb7bd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a mass external link farm, with numerous links pointing to other PDF files hosted on various domains. The document body mentions 'navigation bar mod apk' and includes a URL that suggests a download for such a tool, indicating a lure to trick users into downloading potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sewallcommunications.com/uploads/1/3/0/6/130603793/130603793.html#navigation+bar+mod+apk
    • http://fedresumes.us/uploads/1/3/0/5/130588286/nuduxipepuper.pdf
    • http://nausettherapy.com/uploads/1/3/0/6/130639453/108348798ca.pdf
    • http://phoeneciang.com/uploads/1/3/0/9/130969279/e7bd9a.pdf
    • http://phoenix-fire-rising.com/uploads/1/3/0/5/130589126/fabibok.pdf
    • http://perlustrate.net/uploads/1/3/1/4/131438840/karazojanifu_mijapigarok.pdf
    • http://mercystreetchurch.com/uploads/1/3/0/4/130436095/gudufegive.pdf
    • http://happygrassstudio.com/uploads/1/3/0/6/130605186/7286853.pdf
    • http://onsoe.net/uploads/1/3/0/4/130476859/fac255c381077b.pdf
    • http://deiureavvocatiassociati.com/uploads/1/3/1/3/131397934/6970e9.pdf
    • http://mariposa-smoothies.com/uploads/1/3/0/6/130604290/jefovawo.pdf
    • http://dcbwrites.com/uploads/1/3/0/6/130604430/8341233.pdf
    • http://thesprightlymovement.com/uploads/1/3/0/5/130588185/misivog_loxanawir_noxekimifagufa.pdf
    • http://wellnessatbarwonheads.com/uploads/1/3/1/0/131069934/sepuboji.pdf
    • http://csikcd.com/uploads/1/3/0/3/130324203/xazina_tinidap_puxulonewajalo_lekezulobodow.pdf
    • http://ioannaconceptstore.com/uploads/1/3/0/6/130621846/nejofurumikikireda.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_off000065e1.bin
284fc2e2fcb34175b5df18aa0928fb3fc20cc32b149ceea35c27df10741f5bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 7832 bytes
font_01_sfnt_off00008486.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 2668 bytes

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