Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374b24c39c6858d…

MALICIOUS

PDF

41.2 KB Created: 2020-04-10 10:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 311421b20346a93922bd0f0ca60f286f SHA-1: e80c0a4c6dce2e1091c1e7170f39471baaf7d82f SHA-256: 1374b24c39c6858d88d83aa7c945282349fb3ec4e88ac4a4e536dbd15ac8a910
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to further malicious content or phishing pages.

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://teachersforsocialjusticelv.com/uploads/1/3/0/2/130274145/130274145.html#apache+camel+in+action+2+pdf
    • http://themusiciansplayground.org/uploads/1/3/1/1/131163863/jitunevotibevif.pdf
    • http://ihtnews.com/uploads/1/3/1/4/131406013/4860567.pdf
    • http://musehb.com/uploads/1/3/1/1/131164351/1453599.pdf
    • http://ramenerlaplagecheztoi.com/uploads/1/3/0/6/130603852/susisiliriw_paxinisope_vodexede_deros.pdf
    • http://mcclennywoodhousehauling.com/uploads/1/3/0/2/130272877/sefusononon.pdf
    • http://100womenwhocarensc.com/uploads/1/3/0/5/130538859/kukuvijumizigarifonu.pdf
    • http://nvshomes.com/uploads/1/3/0/3/130313193/pitulokelos-pivofesosari-kubolefuzinad.pdf
    • http://middletnrentalhomes.com/uploads/1/3/0/5/130588502/1830924.pdf
    • http://itsabouttimetlc.com/uploads/1/3/0/5/130589179/nisoveb.pdf
    • http://think-bliss.com/uploads/1/3/0/3/130323461/0666f7122c40c6e.pdf
    • http://printmtl.com/uploads/1/3/1/4/131454420/9840353.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_off0000793f.bin
4dda855076c614d9989ec385a24d6ffa4013b698e73fbdd20be39ff1455dfd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793F 7940 bytes

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