Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2518141c39165c0…

MALICIOUS

PDF

40.3 KB Created: 2020-03-29 05:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d97158d1878e4819191d664969c8ecf5 SHA-1: b1b77db8c44bf331bf9a717cb88640545e5ca998 SHA-256: d2518141c39165c089d096497ba0d0d93de20ac14fbc66c0563aaf32066d07ca
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 numerically or generically named, suggesting a link farm or SEO manipulation tactic. The primary lure appears to be a guide on creating digital photo albums, directing users to the URL http://74-123-77-236.mgwnet.com/uploads/1/3/0/7/130738799/130738799.html#como+hacer+un+album+de+fotos+digital+en+mac. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of numerous external links.

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://74-123-77-236.mgwnet.com/uploads/1/3/0/7/130738799/130738799.html#como+hacer+un+album+de+fotos+digital+en+mac
    • http://www.scheffleralamode.com/uploads/1/3/0/7/130739423/a58d0.pdf
    • http://partystyleddc.com/uploads/1/3/0/4/130478831/sufudawubanoxiru.pdf
    • http://rwhallsofivy.com/uploads/1/3/0/6/130603728/a6e9f38ec875458.pdf
    • http://thenewtelevisionshow.com/uploads/1/3/0/3/130379146/7d95c4908d4.pdf
    • http://cvillehomeimprovements.com/uploads/1/3/0/4/130477126/c59dd.pdf
    • http://mail.justanothersunday.com/uploads/1/3/0/4/130476619/vijadidabupuw_ruwijigim_metun.pdf
    • http://accreteequitypartners.com/uploads/1/3/0/4/130435711/03f4f88c119479.pdf
    • http://adoulaforme.com/uploads/1/3/0/2/130272362/zarak.pdf
    • http://goldenstatepsych.com/uploads/1/3/0/7/130739837/jozazudisuxe.pdf
    • http://lynnesgarden.com/uploads/1/3/0/5/130543373/ba125c18b95999.pdf
    • http://mibedandbreakfast.com/uploads/1/3/0/5/130551700/3677135.pdf
    • http://postmaster.ikifitlab.jp/uploads/1/3/0/6/130620882/josis.pdf
    • http://www.darajainternational.com/uploads/1/3/0/7/130738863/9bdf7dbf6c.pdf
    • http://obratovluge.com/uploads/1/3/0/2/130271205/5831767.pdf
    • http://justforyouspa.com/uploads/1/3/0/5/130590763/a78129.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_off000072bc.bin
413c1987c47a9ec0286f72d12b8f84d142508426143b8269f7c07fed44678045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 9288 bytes

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