Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d1658e706a481b…

MALICIOUS

PDF

50.1 KB Created: 2020-03-31 12:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 457e88c65e91cf5164d35781e4c89f2b SHA-1: 39033cc11d5c36de0d14ccdbd909199cad168dfc SHA-256: 66d1658e706a481b6a0b28c5d6f99c4112edb67be196477f3bffe314209fefa0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a large number of embedded external URLs, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These URLs likely lead to malicious content or are used for SEO spam, suggesting the document's primary purpose is to redirect users to potentially harmful websites.

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://francescocamuglia.com/uploads/1/3/0/5/130550985/130550985.html#presion+hidrostatica+fisica+ejemplos+resueltos
    • http://nepahomesweethome.com/uploads/1/3/1/0/131070572/lapisi.pdf
    • http://playtolearnenglish.com/uploads/1/3/0/5/130539759/8118764.pdf
    • http://mayfairre.com/uploads/1/3/0/7/130775728/81450d83d5daea7.pdf
    • http://levelupcareeradvice.com/uploads/1/3/0/5/130543663/gobixunirat.pdf
    • http://pdsmfg.com/uploads/1/3/0/6/130604332/menimatil.pdf
    • http://kvoambernath.com/uploads/1/3/0/5/130590608/9107132.pdf
    • http://nextcap.us/uploads/1/3/0/8/130814993/d524c24e572.pdf
    • http://learntoreadpersianstories.com/uploads/1/3/1/1/131163559/55eef.pdf
    • http://airbornetrafficreports.com/uploads/1/3/1/3/131384025/6635332.pdf
    • http://guitarlessonsredding.com/uploads/1/3/0/6/130604074/foferape.pdf
    • http://uni-scale.com/uploads/1/3/0/6/130621202/fdc6b.pdf
    • http://jerseyshorejewelry.com/uploads/1/3/0/7/130776603/2279991.pdf
    • http://simplykova.studio/uploads/1/3/0/8/130813025/e547a933.pdf
    • http://simsafely.com/uploads/1/3/0/9/130969707/9138386.pdf
    • http://scalemodelstudio.com/uploads/1/3/0/4/130476555/7331192.pdf
    • http://srcstudents.com/uploads/1/3/0/7/130775256/nudovaf.pdf
    • http://videogamesandmachineguns.net/uploads/1/3/1/3/131380487/31b095eca58.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000700f.bin
9a64b7f1c714dadc3da85c932f98430edf51b184e02154470c362138907c8379
pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 9424 bytes
font_01_sfnt_off000091c3.bin
05955cebda01fcbe0639829172f5945715735499774403bb1159286c08576b77
pdf-font-stream PDF embedded font (sfnt) at offset 0x91C3 4208 bytes
font_02_sfnt_off0000a190.bin
1ca453b52d22025ebb45f5f5986a2844d6a222d34e9537fd46edf08a287f0a95
pdf-font-stream PDF embedded font (sfnt) at offset 0xA190 16652 bytes