Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3778ce2fde389e…

MALICIOUS

PDF

47.9 KB Created: 2020-06-09 01:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: cd1140d3deada7145f59eab5003fea73 SHA-1: 7747ad435e22ad717af289040807a25c4a37b4ae SHA-256: de3778ce2fde389e673122e1419ace37f2abe2b7f2ae3c6388660ac45fdeec39
136 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, and the embedded URL points to a page that appears to be a lure. The ML classifier strongly suggests maliciousness. No scripts were extracted, but the structure and link farm indicate a likely SEO spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://informd.com.au/uploads/1/3/0/9/130969437/130969437.html#liste+verbes+r%25C3%2583%25C2%25A9guliers+espagnol PDF link annotation
    • http://hickscapitalgroup.com/uploads/1/3/1/3/131398254/389697c8f.pdfIn PDF document text
    • http://mx.guestcaboose.com/uploads/1/3/0/5/130588827/kezevidanoxik.pdfIn PDF document text
    • http://gotoclosecom.com/uploads/1/3/0/5/130551857/8439612.pdfIn PDF document text
    • http://cooperstownveterinaryassociates.preview.pethealthnetworkpro.com/uploads/1/3/1/4/131437977/buliwilijigagen.pdfIn PDF document text
    • http://hostmaster.mnbdesigns.co.uk/uploads/1/3/0/6/130620878/rubenulesavuwe_taxofod.pdfIn PDF document text
    • http://phincycle.com/uploads/1/3/0/6/130639983/74eba152a1f86.pdfIn PDF document text
    • http://david.fumctupelo.com/uploads/1/3/1/4/131438164/vinareroz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zopowozofoje.files.wordpress.com/2020/06/vojakuz.pdfIn PDF document text
    • https://tazaradoz.files.wordpress.com/2020/06/lefekuxoxoke.pdfIn PDF document text
    • https://bulijedakuve.files.wordpress.com/2020/06/newuponezawijunuduxajuraj.pdfIn PDF document text
    • https://javasevob.files.wordpress.com/2020/06/45775756044.pdfIn PDF document text
    • https://dijeduzibug.files.wordpress.com/2020/06/tesufudojeseraw.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
    • http://scripts.sil.org/OFLIn PDF document text

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_off000088ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88EA 13908 bytes
SHA-256: 8de4a9f5f185e3aaf6919c563b005673bc9e2f2bf7ba5c0dd56357f79ea029d4

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