Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deb603471fe05df…

MALICIOUS

PDF

71.5 KB Created: 2020-03-29 13:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf02fadeb3ea3649b95c6c486fb7b65f SHA-1: 0470e04876b25e7fb10262a606995c8a2fa5a8ab SHA-256: 8deb603471fe05dffbe2fc303454daca98e4c89686609dee4084e6646c62f90f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm for SEO manipulation or phishing. The ML classifier strongly indicated maliciousness. The embedded URL in the document body, 'http://74-123-75-235.mgwnet.com/uploads/1/3/1/4/131406453/131406453.html#conclusion+de+movimiento+en+una+y+dos+dimensiones', is likely part of the lure to direct users to malicious content.

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://74-123-75-235.mgwnet.com/uploads/1/3/1/4/131406453/131406453.html#conclusion+de+movimiento+en+una+y+dos+dimensiones
    • http://tinytownllc.com/uploads/1/3/0/8/130814921/rufemabupor.pdf
    • http://tessalynfarrell.com/uploads/1/3/0/4/130476539/fd4dc593f25fd.pdf
    • http://realjamesriley.com/uploads/1/3/0/7/130776032/7547162.pdf
    • http://miamipropertyclaim.com/uploads/1/3/0/7/130776122/5d949.pdf
    • http://readingsbykata.com/uploads/1/3/0/5/130589354/mekolawaturun.pdf
    • http://burlingtonrenos.com/uploads/1/3/0/4/130488631/mamixo_golesataxotiziw_malijezaxi_nopugonejin.pdf
    • http://rijkewijnen.nl/uploads/1/3/1/1/131163494/6955677.pdf
    • http://givewreathsachance.com/uploads/1/3/0/2/130273625/kuvegomunu.pdf
    • http://expressrelocators.com/uploads/1/3/0/6/130620564/1854679.pdf
    • http://unioneast.net/uploads/1/3/0/2/130272606/f5adb62cb.pdf
    • http://martinezseafood.net/uploads/1/3/0/7/130775451/a3e1a14a6e4395.pdf
    • http://somethingblueresale.com/uploads/1/3/0/9/130969368/gurogo-lobijojalig-waseredig-rakalabi.pdf
    • http://tarjetaspostalesymasbakerstore.com/uploads/1/3/0/6/130603847/8608639.pdf
    • http://keepinitfrosty.com/uploads/1/3/0/7/130738971/c5c9b2b649.pdf
    • http://leverage-smart.com/uploads/1/3/0/4/130489229/votisuwe.pdf
    • http://sadieco.com/uploads/1/3/0/4/130435516/fududavugila.pdf
    • http://teambuckmetropolitan.com/uploads/1/3/0/5/130539660/pipire-tozotezelulus.pdf
    • http://hospicehearts.org/uploads/1/3/0/2/130272571/kajaziditadugaxuxoxo.pdf
    • http://freedomfit121.com/uploads/1/3/1/1/131164199/834389.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c970.bin
7d0e4f26927737c593ed7efda103a1107150fe3ac8ddbcafaf6ee6c0af50a0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 1588 bytes
font_01_sfnt_off0000d126.bin
db63c80ee46e1cda12ffe4ee0d54cee30614aaf6499bdebe626225f98516dd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 11224 bytes
font_02_sfnt_off0000f868.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16036 bytes

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