Malicious PDF — malware analysis report

Static analysis result for SHA-256 052f13fb8458b4b4…

MALICIOUS

PDF

43.7 KB Created: 2020-03-17 12:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38a70dcd787e42d81ab9af92456d4b98 SHA-1: 481f00a2f342febb16cf824872305cf2ac4cc906 SHA-256: 052f13fb8458b4b4a47e3a86fe3e95a60b5dceff67ebd5c4fd53515319ae8e5e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The document body, though containing seemingly innocuous text about breastfeeding positions, is likely a lure to disguise the malicious intent of the embedded 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://uibffworld.org/uploads/1/3/0/2/130289495/130289495.html#posiciones+para+amamantar+a+un+bebe+con+reflujo
    • http://splitnest.com/uploads/1/3/0/7/130776267/7340348.pdf
    • http://valsellsfresnohomes.com/uploads/1/3/0/7/130776603/3d52acd76f702.pdf
    • http://www.wildberberis.com/uploads/1/3/0/9/130969707/7691181.pdf
    • http://plantbasedphysio.com/uploads/1/3/0/7/130775870/4840514.pdf
    • http://andarts.co.uk/uploads/1/3/0/6/130620454/fitutizimenif_vavivume.pdf
    • http://janiceandersonmusic.com/uploads/1/3/0/4/130476229/794542b.pdf
    • http://islamic-global.net/uploads/1/3/0/7/130776341/sugaw-pemotinawot-kovoxigenotuta-rolexufap.pdf
    • http://mta-sts.mail.salsareno.net/uploads/1/3/0/8/130874247/peladeparoz.pdf
    • http://glorious-rain.com/uploads/1/3/0/5/130551021/8308667.pdf
    • http://preventitol.com/uploads/1/3/0/8/130874358/paravoxonafux_tuxumefen_laketo.pdf
    • http://www.cyberspacedetectives.com/uploads/1/3/0/6/130639164/xovetixuw.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_off00008316.bin
0da5aea71e790e2e254a1015993ac8a82596309895011335478c3a4461057642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8316 8340 bytes

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