Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b44d53c44211e3d…

MALICIOUS

PDF

46.9 KB Created: 2020-05-20 17:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: fb0142ae6c111f7cb573469bc91b55bb SHA-1: a6a9ad0101a17c8fb366123f055e3e187d1f76f8 SHA-256: 8b44d53c44211e3dd6402a508bee0f64bfc2a5010f3c6478e270100df1f77e5f
96 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, a common technique for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thesingbabysingshow.com/uploads/1/3/0/2/130288864/130288864.html#ejercicios+de+presion+resueltos PDF link annotation
    • http://cainesauto.com/uploads/1/3/0/6/130639698/sorotabalet-vizob-zejamozosax.pdfIn PDF document text
    • http://ginnyharris.com/uploads/1/3/0/6/130620453/gulomozepa.pdfIn PDF document text
    • http://mc4ocala.org/uploads/1/3/1/4/131438405/pibaje_mijavorib_fuvarul_xibepuledixife.pdfIn PDF document text
    • http://100leaderswhocook.com/uploads/1/3/0/3/130323249/9611861.pdfIn PDF document text
    • http://ldoublervending.com/uploads/1/3/1/4/131407143/wezijivotut.pdfIn PDF document text
    • http://norby.consulting/uploads/1/3/0/7/130775519/gotuvekew.pdfIn PDF document text
    • http://uniquehousebuyers.net/uploads/1/3/0/5/130589250/6457065.pdfIn PDF document text
    • http://verityrecycling.com/uploads/1/3/0/3/130379074/zixogamopu.pdfIn PDF document text
    • http://buy-ritehomes.com/uploads/1/3/0/5/130542775/4028674.pdfIn PDF document text
    • http://zoes-strictly-xmas.org/uploads/1/3/0/7/130776564/narafubew-fazonetasapu-bemavanesa-naxiwu.pdfIn PDF document text
    • http://your-cbd-connection.com/uploads/1/3/0/6/130605019/e74da5.pdfIn PDF document text
    • http://serenitynaturalcare.net/uploads/1/3/1/3/131383775/7912862.pdfIn PDF document text
    • http://vvsphoto.com/uploads/1/3/0/2/130272417/gelalaxusuzitibebife.pdfIn PDF document text
    • http://aquasnowburst.com/uploads/1/3/0/6/130604934/jotolekalosirik-fevolixipoxa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6878 2208 bytes
SHA-256: 7bbce6d1584f03185bb359ffdd9b147608fe27edd9a5a531afce2bf04fc28753
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 11520 bytes
SHA-256: 0dbfc7e64f6db5610e4b04454437135b61094d616087ffad94dbb80331a6e1e4
font_02_sfnt_off0000982b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982B 16304 bytes
SHA-256: 2ec471bc1dd097ba7445d0d98fae4076614f7d308a936bf5c28a382db3fe60d2

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