Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfd224c4a140fde…

MALICIOUS

PDF

39.4 KB Created: 2020-04-03 13:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 563f78383aa7471d489be6c242b618de SHA-1: a5cba6d52675b24e519cde5554daacbaee6cb06e SHA-256: ecfd224c4a140fdeb57f17f6a6deee13ee0964950c865804160955555a759db1
136 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. The document body, though partially corrupted, contains references to these URLs, including one that points to a specific HTML page and others to PDF files. This suggests a link farm or redirection scheme, likely intended to manipulate search engine results or lead users to malicious content hosted on these domains.

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://compassionatebehavioralservices.com/uploads/1/3/0/6/130604176/130604176.html#dominio+de+una+funcion+radical+de+indice+par PDF link annotation
    • http://autodiscover.douglasenoblepainting.com/uploads/1/3/0/6/130620745/f58fff67c49.pdfIn PDF document text
    • http://mimibug.com/uploads/1/3/0/9/130969137/parenuzugemipuka.pdfIn PDF document text
    • http://bigriverfilmfestival.com/uploads/1/3/0/4/130483294/16a5bcb948d0.pdfIn PDF document text
    • http://theinkparlourkelowna.ca/uploads/1/3/0/4/130483202/2178705.pdfIn PDF document text
    • http://dreamcityhealing.co/uploads/1/3/0/6/130621900/dufaponakeloge.pdfIn PDF document text
    • http://emergencymen.com/uploads/1/3/0/2/130271060/a5a576e3b36.pdfIn PDF document text
    • http://emgrainger.com/uploads/1/3/0/7/130775106/8361b.pdfIn PDF document text
    • http://davidmcauley.com/uploads/1/3/0/4/130436307/915321.pdfIn PDF document text
    • http://doorstepdiy.com/uploads/1/3/0/2/130289184/7033325.pdfIn PDF document text
    • http://sigmaenergyexperts.com/uploads/1/3/0/4/130435602/7472408.pdfIn PDF document text
    • http://mariacuriel.com/uploads/1/3/0/5/130551330/wekapifububalabowo.pdfIn PDF document text
    • http://sarah-neale.com/uploads/1/3/0/3/130323337/wolebunaxesavemomani.pdfIn PDF document text
    • http://fyeandbarnes.com/uploads/1/3/0/8/130874101/64460ca.pdfIn PDF document text
    • http://bsb-novels.com/uploads/1/3/0/6/130604040/puzuledaveter_geludozorate_rozoloraga.pdfIn PDF document text
    • http://spultronixperfomance.com/uploads/1/3/0/8/130874380/jigotokepetivef.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
🗂 Part of campaign: douglasenoblepainting.com 5 samples

Related samples 1

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_off00006cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDA 9276 bytes
SHA-256: a2f8a4719f2e03418c94fcf8bd187d85b52e108b62ef135a3058a3474534dae2

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