Malicious PDF — malware analysis report

Static analysis result for SHA-256 9944cdbe211d4e7d…

MALICIOUS

PDF

40.6 KB Created: 2020-03-29 07:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c15d207371ae5efc98f10a5da2884acf SHA-1: 71a3e425fd39fc34f046e224bf0ebedb0b102e1d SHA-256: 9944cdbe211d4e7d99649c60aec68b6f052c00626dfab0f38701f5d47aa09474
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files on similar domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs supports this assessment. The document body text, though heavily obfuscated, contains a URL that appears to be the primary lure.

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://supersealusa.com/uploads/1/3/0/6/130621425/130621425.html#excel+max+if+multiple+criteria+with+array PDF link annotation
    • http://redandrio.com/uploads/1/3/0/6/130639852/reweme.pdfIn PDF document text
    • http://slowventures.net/uploads/1/3/0/2/130273791/1774008.pdfIn PDF document text
    • http://mxwdjty.com/uploads/1/3/0/5/130547576/mijananej.pdfIn PDF document text
    • http://edmontoncompressionstocking.com/uploads/1/3/0/5/130551654/5834414.pdfIn PDF document text
    • http://hungernerve.net/uploads/1/3/0/2/130292089/dumutube-piviren-pevufojaba.pdfIn PDF document text
    • http://mta-sts.mx.bcfca.org/uploads/1/3/0/6/130605176/vimut.pdfIn PDF document text
    • http://maisondevacances-andalousie.com/uploads/1/3/0/8/130814623/3099118.pdfIn PDF document text
    • http://www.botoxroswell.com/uploads/1/3/0/7/130776021/51aede3018e3638.pdfIn PDF document text
    • http://zulushuluskidsandfamilyyoga.com/uploads/1/3/0/3/130313741/56b0a3446e86852.pdfIn PDF document text
    • http://mandagefoundation.org/uploads/1/3/0/6/130639549/xedatelex.pdfIn PDF document text
    • http://joangiffels.com/uploads/1/3/0/3/130323106/sifure-juwipoxax-xewotirutiba.pdfIn PDF document text
    • http://andythemechanic.com/uploads/1/3/0/7/130776277/7088030.pdfIn PDF document text
    • http://www.denvercoit.com/uploads/1/3/0/7/130776891/midolij_zufusirosi.pdfIn PDF document text
    • http://ntellectlaw.com/uploads/1/3/0/7/130775652/wusedawavozevepa.pdfIn PDF document text
    • http://amberclements.com/uploads/1/3/0/8/130874163/6fcfd7dd10649.pdfIn PDF document text
    • http://comofracasarenlosestadosunidos.com/uploads/1/3/0/2/130287463/kazufijike.pdfIn PDF document text
    • http://megjamesillustration.com/uploads/1/3/0/6/130640182/wixibipulizevesit.pdfIn PDF document text
    • http://74-123-77-91.mgwnet.com/uploads/1/3/0/7/130739169/42305cb4b8.pdfIn PDF document text
    • http://howatt-bio.com/uploads/1/3/0/7/130775853/1290846.pdfIn PDF document text
    • http://www.jen-velez.info/uploads/1/3/0/4/130488288/9067568.pdfIn PDF document text
    • http://samesexweddingsinfrance.com/uploads/1/3/0/6/130603704/b7aa4f85a00179.pdfIn PDF document text
    • http://recutter.com/uploads/1/3/0/7/130739761/kowopomupavi_dojizajuzom_xerusutizef_domepagofe.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_off00007424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7424 8388 bytes
SHA-256: 1185f9e32f2233d1933fee3684f8387e5fd869bf128b130e26fd0feab1a26831

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