Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b05f2dceea8d5c…

MALICIOUS

PDF

36.4 KB Created: 2020-06-06 00:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12bf14c19d32a5d907df91c3bf0d8180 SHA-1: a160c940358cd3ca9b5eef71bacd5c7baa5fc1c7 SHA-256: d7b05f2dceea8d5c5aa61b71083685a1de7c9ca3785dd83b04d20d3cf91fdea0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The primary intent appears to be SEO manipulation or directing users to potentially malicious content hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, suggesting a coordinated effort to distribute content or traffic.

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://youbrewchicago.com/uploads/1/3/0/5/130551330/130551330.html#ccent+exam+questions+and+answers+pdf
    • http://southerndes.net/uploads/1/3/0/2/130289096/jejawuwuxux.pdf
    • http://harthumaneanimalrescueteam.org/uploads/1/3/0/5/130551267/belotar-wevulu-zuwofojara.pdf
    • http://jindulanqiubocaiwangzhan.br3h.com/uploads/1/3/1/3/131383342/mimigog.pdf
    • http://menallenfriends.com/uploads/1/3/0/7/130775186/2112862.pdf
    • http://autodiscover.eastcoastguitarexpo.com/uploads/1/3/0/3/130313150/7613538.pdf
    • http://doctorsofcolumbus.com/uploads/1/3/0/7/130776724/7515444.pdf
    • http://electboundyjudge.com/uploads/1/3/0/7/130739290/batuw_rovonakebewobed.pdf
    • http://youbrewchicago.com/uploads/1/3/0/5/130551330/terms.html
    • http://youbrewchicago.com/uploads/1/3/0/5/130551330/dmca.html
    • http://youbrewchicago.com/uploads/1/3/0/5/130551330/policy.html
    • https://zapokowivuz.files.wordpress.com/2020/06/69664410076.pdf
    • https://dazixapuj.files.wordpress.com/2020/06/jagoguzavigosowaxutosale.pdf
    • https://kibewozotag.files.wordpress.com/2020/06/19339042858.pdf
    • https://likabizev485265161.files.wordpress.com/2020/06/nigivokufajuf.pdf
    • https://govojixifigo.files.wordpress.com/2020/06/kedunidejekijigowobikoxe.pdf
    • https://pufexek.files.wordpress.com/2020/06/3690153374.pdf
    • https://ziwuses.files.wordpress.com/2020/06/41527469471.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_off000060eb.bin
e5188e90b452944f1ffe541ffb1f89e18334fe4540647ed62639b306954d3572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 11184 bytes

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