Malicious PDF — malware analysis report

Static analysis result for SHA-256 498ef0558b631642…

MALICIOUS

PDF

31.0 KB Created: 2020-06-10 02:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: d1c22be9871991efefc60ec72c159079 SHA-1: c0cd1d7a3df87a2dda6d0bc15b7214e38835707c SHA-256: 498ef0558b6316425100f29bb3842660a45e9367a8ee1a5c9e0ed91da62850e9
104 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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, http://mail.yourimmobile.de/uploads/1/3/0/6/130639546/130639546.html#fortnite+default+dance+earrape, is directly visible in the document body. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mail.yourimmobile.de/uploads/1/3/0/6/130639546/130639546.html#fortnite+default+dance+earrape PDF link annotation
    • http://prorulesrefs.com/uploads/1/3/0/7/130775949/fululo_lukaga_migubulifofono.pdfIn PDF document text
    • http://creativebev.net/uploads/1/3/1/6/131637631/5799688.pdfIn PDF document text
    • http://8amo5.bpmtc.com/uploads/1/3/1/4/131437693/e5643f4a473cf3.pdfIn PDF document text
    • http://mx.deborahvoss.com/uploads/1/3/1/1/131163857/08acefcee9d3f78.pdfIn PDF document text
    • http://acikhatal.com/uploads/1/3/0/6/130622084/8523515.pdfIn PDF document text
    • http://mail.natuurlijkdierenarts.nl/uploads/1/3/1/4/131437670/1474137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jipebowojor.files.wordpress.com/2020/06/18463765292.pdfIn PDF document text
    • https://javasevob.files.wordpress.com/2020/06/sigasutad.pdfIn PDF document text
    • https://nirakopifaz.files.wordpress.com/2020/06/51694071800.pdfIn PDF document text
    • https://leludibowen.files.wordpress.com/2020/06/venuti.pdfIn PDF document text
    • https://mikopozup.files.wordpress.com/2020/06/fowozazewaxaxewab.pdfIn PDF document text
    • https://bijijelu.files.wordpress.com/2020/06/topemaxewabi.pdfIn PDF document text
    • https://fonosusuba.files.wordpress.com/2020/06/wiroso.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://scripts.sil.org/OFLIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5B 10360 bytes
SHA-256: 76f14a7418c1e76a3df58946123d4c09bb0791a3501caf86f9ef9480dc8671ce

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