Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad84f7a9b65d4e17…

MALICIOUS

PDF

37.4 KB Created: 2020-06-01 04:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34fe40f7d6a14cde1d1a80e74562de17 SHA-1: 25c6f605358badc7f9508f3676c10a352fdb6fd6 SHA-256: ad84f7a9b65d4e1748837b78bfa934c4afa0f2c8636bda46964304f2f3e816f2
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to distribute malicious content or engage in SEO abuse. The document body text, though partially corrupted, includes the phrase "Proceso de contratacion de personal pdf" and several URLs, reinforcing the lure to external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://charlottepulsecenter.net/uploads/1/3/0/2/130287992/130287992.html#proceso+de+contratacion+de+personal+pdf
    • http://webdisk.lmairtech.com/uploads/1/3/1/6/131637562/xabevuwamaka.pdf
    • http://spreadyourwingstravel.net/uploads/1/3/0/6/130620923/2fe30685ffb8.pdf
    • http://mta-sts.mail.hworchestra.org/uploads/1/3/0/8/130873986/8099974.pdf
    • http://housewash.us/uploads/1/3/0/3/130323315/tupidoboxuvavuv.pdf
    • http://peacepoplar.org/uploads/1/3/1/6/131606006/c2d2e4.pdf
    • http://kalyaan.org/uploads/1/3/0/7/130739459/3c978dd3.pdf
    • http://jasonetonscott.com/uploads/1/3/0/5/130550881/xonapavu.pdf
    • http://ecosoccdiaspora.org/uploads/1/3/0/7/130739290/1427352.pdf
    • https://vafixumev.files.wordpress.com/2020/05/zonopame.pdf
    • https://gepuguxiro.files.wordpress.com/2020/05/13877939719.pdf
    • https://xuzubika.files.wordpress.com/2020/05/53619691698.pdf
    • https://porugisi.files.wordpress.com/2020/05/wakoduvadeniganuwore.pdf
    • https://zakudapure.files.wordpress.com/2020/05/nemigud.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_off00006598.bin
0c93e26a05aa81f89c571a3ac6786f97204e96b4b423541c7e57026b46ee6864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 10748 bytes

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