Malicious PDF — malware analysis report

Static analysis result for SHA-256 657aef5fc6e41e88…

MALICIOUS

PDF

52.7 KB Created: 2020-04-03 14:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 86447a15268ad1b1db6c568f46edd9ff SHA-1: 027a454925bc34e243c3e4209477bc08a03ca9ab SHA-256: 657aef5fc6e41e883982b94fa1f8548d47e497d1c68ce458a679f81b2ab3e763
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains a large number of external links to other PDF files. The primary attack pattern observed is a link farm designed to trick users into downloading potentially malicious content. The embedded links suggest a spearphishing attachment vector, aiming to deliver further malware.

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://jenntreado.com/uploads/1/3/1/0/131071191/131071191.html#download+lagu+hana+wa+saku+%28flowers+will+bloom%29
    • http://grupoberbes.es/uploads/1/3/1/4/131407181/ligakopotimeji.pdf
    • http://morwacreditandinvestmentse.com/uploads/1/3/1/4/131410662/5016160.pdf
    • http://lavendershop.org/uploads/1/3/0/2/130289756/wunoxo-wiranu.pdf
    • http://riseupphoenix.org/uploads/1/3/0/5/130590467/bufudomunixanojanaje.pdf
    • http://litigatingforchange.org/uploads/1/3/0/8/130874122/buduxopawazeje_lebuvakisomolaj.pdf
    • http://tracynovakconsulting.com/uploads/1/3/0/2/130288661/jofitukukufo.pdf
    • http://leeknappstudios.com/uploads/1/3/0/7/130776183/mixixisazutukebumu.pdf
    • http://cowboyupcoffee.com/uploads/1/3/0/7/130739431/ffbd271b0.pdf
    • http://homeservicesplus.com/uploads/1/3/0/4/130476709/9327990.pdf
    • http://dinoscoresheet.com/uploads/1/3/0/4/130476180/romasupigenusapivex.pdf
    • http://voyagefitness.org/uploads/1/3/0/5/130590399/nedogotafijag.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c4c.bin
7aa47ba3784084c6c29b8e831560a602d3983c2688448e7d443e92941eae43c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4C 9496 bytes
font_01_sfnt_off0000a009.bin
2f37b71a02a29a33815fed14560f08a1b2196b62e44ab79a9fc78c3a349acf9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA009 11068 bytes

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