Malicious PDF — malware analysis report

Static analysis result for SHA-256 4465d8da7057223e…

MALICIOUS

PDF

39.1 KB Created: 2020-03-14 18:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 34078a82e0049213259ad5ed84e5a315 SHA-1: f4dd42f105eae6c5a0fccb226f342317a7b29b5b SHA-256: 4465d8da7057223eaa6bdf2de40673fdce9ed48f27651b67946068ed0b89944f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many of which are dynamically generated and point to PDF files on various domains. The document body, though partially corrupted, suggests a lure related to a 'housing medical form'. The presence of numerous SEO-optimized links indicates a potential link farm designed to distribute malicious content or lead to phishing pages. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.smileyourecute.info/uploads/1/3/0/5/130589222/130589222.html#central+bedfordshire+council+housing+medical+form PDF link annotation
    • http://www.blakekickscancer.com/uploads/1/3/0/7/130739793/bizepetebowuwaronubi.pdfIn PDF document text
    • http://elliefernandez.com/uploads/1/3/0/5/130590323/nodosodefusewes-xojuxesekavofi-wuluregisibola.pdfIn PDF document text
    • http://thelibertyletters.com/uploads/1/3/0/5/130550876/jidukadaroxasawejin.pdfIn PDF document text
    • http://nowphotobooths.com/uploads/1/3/0/4/130488114/papelufu-sonibono-zosojusugolini-wezan.pdfIn PDF document text
    • http://seacoastbikes.com/uploads/1/3/0/9/130969705/4190819.pdfIn PDF document text
    • http://nest.hatch.vn/uploads/1/3/0/4/130435658/8c1af70f.pdfIn PDF document text
    • http://maineassistivetechnologysolutions.com/uploads/1/3/0/6/130621781/1325004.pdfIn PDF document text
    • http://mail.thetownbarber.co.uk/uploads/1/3/0/2/130288592/2451146.pdfIn PDF document text
    • http://www.hwy2hvn.com.au/uploads/1/3/0/6/130621245/4108101.pdfIn PDF document text
    • http://energygrouphr.com/uploads/1/3/0/4/130488483/1418277.pdfIn PDF document text
    • http://archonautix.com/uploads/1/3/0/9/130969659/gozosijutolusit_lisamapuxuva_luwotikodok.pdfIn PDF document text
    • http://agtechday.com/uploads/1/3/0/5/130588651/dewanopik_fajuriwekivu.pdfIn PDF document text
    • http://hipaawebcasts.com/uploads/1/3/0/7/130739430/6825805.pdfIn PDF document text
    • http://skyeguy.com/uploads/1/3/0/4/130491008/xelelop_vivogererukova_gajegisimara.pdfIn PDF document text
    • http://behuninvocalstudio.com/uploads/1/3/0/6/130621788/velaw-raxulutuda-vozedezepum.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

Related samples 2

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_off00006de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE6 8600 bytes
SHA-256: 63f070ae502abb009775a56c343b650f4c7afa1100922fc51d95362a3b9e2550

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