Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd7b61120bcdd5b…

MALICIOUS

PDF

44.6 KB Created: 2020-03-27 08:38:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: acbcfd85573ab45a86a46660f16401d0 SHA-1: 7f5fa9c486a94fb17740bfa3150be5e0937114cf SHA-256: cdd7b61120bcdd5bf96a8b154af1420510d9ce615b2410ef57d6e169621b2e9b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 poisoning tactic. The document body, though partially corrupted, contains a reference to a user manual and includes URLs that are likely intended to redirect the user to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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://opssecurityagency.com/uploads/1/3/0/7/130739603/130739603.html#haier+intelius+washing+machine+user+manual PDF link annotation
    • http://mail.amfcleanup.com/uploads/1/3/0/7/130739351/dilejeperumar_ditap.pdfIn PDF document text
    • http://inamphoe.com/uploads/1/3/1/3/131380973/dizevej.pdfIn PDF document text
    • http://dumpsterrentalsnaples.com/uploads/1/3/0/6/130604140/zizafibibijem-gakuxanawi-lopugenamex-nuvazixir.pdfIn PDF document text
    • http://www.bagleyallschoolreunion2019.com/uploads/1/3/0/4/130483772/mexafeges.pdfIn PDF document text
    • http://greekexpress.shop/uploads/1/3/0/3/130313037/jejejexo-kutomebuja.pdfIn PDF document text
    • http://hostmaster.studiomj.eu/uploads/1/3/0/7/130740258/fuwixaturabifebefilo.pdfIn PDF document text
    • http://anakra.org/uploads/1/3/0/2/130288468/5000123.pdfIn PDF document text
    • http://sslandimprovements.com/uploads/1/3/1/0/131070420/3919640.pdfIn PDF document text
    • http://coloringtodecorate.com/uploads/1/3/0/6/130604532/zositobafukuv-xanodolopag-rokuvo.pdfIn PDF document text
    • http://store.rpjandco.com/uploads/1/3/0/4/130483515/c547c8f426.pdfIn PDF document text
    • http://ncplbasketball.org/uploads/1/3/0/5/130589213/b9b01f3b979.pdfIn PDF document text
    • http://www.penelopesattic.com/uploads/1/3/0/7/130740387/0c3277738.pdfIn PDF document text
    • http://correct-dx.com/uploads/1/3/0/2/130287424/pelijofusebagoxarulo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 7924 bytes
SHA-256: 85b26b05a1089ea65605f93372249d246f633404a08614c1de1078d342afe206
font_01_sfnt_off00008eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEC 16260 bytes
SHA-256: 2b57b2f7c8f3bc38d05bd7e1919dcd7d971d606ce90b2da6579e55cc4e86234a

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