Malicious PDF — malware analysis report

Static analysis result for SHA-256 b814259d7be7b70a…

MALICIOUS

PDF

44.9 KB Created: 2020-03-12 06:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23b7e5b24452eb354b798c72463c3cd8 SHA-1: 44d5ecaad4c4d7979651d6b2c742fe4e9570bc73 SHA-256: b814259d7be7b70a11bf6352136e1df4f3e69bf438ef4751f4e1111752c8b108
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body text is heavily obfuscated but contains some of the same URLs found in the heuristics, suggesting a coordinated effort to direct users to potentially malicious or SEO-abusing websites.

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://pangeacoalition.org/uploads/1/3/0/7/130738553/130738553.html#free+crochet+patterns+using+caron+big+cakes
    • http://bransfordmedpsych.com/uploads/1/3/0/7/130775921/5220968.pdf
    • http://host77.carmichaelnl.com/uploads/1/3/0/4/130476740/3966657.pdf
    • http://citypubinfo.com/uploads/1/3/0/5/130588290/5d6835.pdf
    • http://www.sufficientgarden.com/uploads/1/3/0/4/130476818/zagejofonosarusabula.pdf
    • http://dbfg.pindustry.us/uploads/1/3/0/2/130272649/5287424.pdf
    • http://www.linakwon3.com/uploads/1/3/0/2/130271237/golid.pdf
    • http://www.freshset.net/uploads/1/3/0/5/130544132/rotagukaroburo.pdf
    • http://101redirect.com/uploads/1/3/0/2/130289338/e10fdd3a6.pdf
    • http://www.savagesquaw.com/uploads/1/3/0/6/130604168/5db98a.pdf
    • http://teratype.net/uploads/1/3/0/5/130588639/f8e91b6dc55df.pdf
    • http://modernmoroni.org/uploads/1/3/0/4/130476266/fegafol.pdf
    • http://hostmaster.rapportinteriors.com/uploads/1/3/0/7/130775694/nijapujox-turidi-ruzimezoni-sovawafekada.pdf
    • http://holypost.us/uploads/1/3/0/3/130312920/c92663.pdf
    • http://huntington-park-homeowners--association.sb.payhoa.com/uploads/1/3/0/8/130815482/lepuvupexutabomeluma.pdf
    • http://mx.livbeauty.net/uploads/1/3/0/5/130543766/ziduposu.pdf
    • http://justbcosmetics.com/uploads/1/3/0/7/130775752/roxaduvazemu.pdf
    • http://perplexion.net/uploads/1/3/0/4/130489090/vometomumozelit_dodovelokaxus_posopupavupe.pdf
    • http://mta-sts.pack23scouts.com/uploads/1/3/0/6/130621840/5ad1c37143ec.pdf
    • http://masonicformation.com/uploads/1/3/0/3/130323697/7521073.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007873.bin
d200e6a2356efcd965e86c3087e303a8189319614be9efb0ca01bb00575a8218
pdf-font-stream PDF embedded font (sfnt) at offset 0x7873 8944 bytes
font_01_sfnt_off00009a87.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A87 2616 bytes