Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a9c922ab3c21d5…

MALICIOUS

PDF

38.6 KB Created: 2020-06-22 18:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7fbcd611e0f7a37f88808d64395b6515 SHA-1: 41406ae04ef6330cc4f81f55e6ea356e8a0db88a SHA-256: 29a9c922ab3c21d5b256134c76182280af5c0700de8e37268e655dc98e3fe610
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to medical diagnosis and treatment, suggesting a lure to entice users to click the malicious links. No scripts were extracted, and the primary malicious activity appears to be the distribution of numerous links to potentially harmful 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://elementztheshow.com/uploads/1/3/1/4/131437446/131437446.html#current+medical+diagnosis+and+treatment+2013+pdf PDF link annotation
    • http://alshayarecruitmentoffice.com/uploads/1/3/1/6/131637889/bebeb-sokodipudisen-tozuj.pdfIn PDF document text
    • http://hostmaster.goinganywherenice.com/uploads/1/3/1/0/131070625/1785954.pdfIn PDF document text
    • http://highdesertranchwife.com/uploads/1/3/1/6/131606597/lamon_komizo.pdfIn PDF document text
    • http://foodprintscatering.com/uploads/1/3/0/9/130969680/6403563.pdfIn PDF document text
    • http://ravellence.com/uploads/1/3/1/4/131453182/jitulu.pdfIn PDF document text
    • http://pandeliventures.com/uploads/1/3/0/9/130969751/zogofapeduxovuk.pdfIn PDF document text
    • http://firsthandsuccess.com/uploads/1/3/0/6/130604748/c4b71d54b41.pdfIn PDF document text
    • http://vuwwib.com/uploads/1/3/1/8/131856903/bepetanom.pdfIn PDF document text
    • http://lamarato.com/uploads/1/3/0/6/130604896/gunurolarivow.pdfIn PDF document text
    • http://rachelcooksketo.com/uploads/1/3/0/6/130639764/d5cd86d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5411 5868 bytes
SHA-256: bcfa41cbeab27f0a7d6a28f65efbe77860df502cbce47975b577ead4afee1d25
font_01_sfnt_off000067ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 10760 bytes
SHA-256: 669078f8afdc60f43a0bd05ad7c2f866ce904df2c92018b790e0bac24ac8d032