Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c06498a2eafe73…

MALICIOUS

PDF

47.9 KB Created: 2020-03-09 09:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2c79946dff6da980100d88ea8bdeaa77 SHA-1: 8c82f90d4e6419592ac8a32021501a0cb72817ee SHA-256: 55c06498a2eafe73435b7ba7edda41e4f2ca20919ff3990301f0ee4363e5287c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links.

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://gkbbbq6.brdge.org/uploads/1/3/0/4/130477293/130477293.html#abordagem+sistemica+em+psicologia PDF link annotation
    • http://minniecrockwell.com/uploads/1/3/0/4/130489247/1542f675c1b330.pdfIn PDF document text
    • http://nolimitationsyouthservices.org/uploads/1/3/0/7/130776616/3910333.pdfIn PDF document text
    • http://www.morrisseauartist.com/uploads/1/3/0/7/130775951/mezukupasewilu.pdfIn PDF document text
    • http://lisaungerbuehler.com/uploads/1/3/0/8/130874085/8824888.pdfIn PDF document text
    • http://mail.whitethornequinehealth.com/uploads/1/3/0/6/130604700/jugiwegabonig-dokapepomadege.pdfIn PDF document text
    • http://roelandstrading.com/uploads/1/3/0/6/130639214/tusij_dabuvepa_lavaxib.pdfIn PDF document text
    • http://ivjournal.org/uploads/1/3/0/2/130291358/9768129.pdfIn PDF document text
    • http://redditocittadinanzaindipendente.it/uploads/1/3/0/7/130775435/jinevuliruvidusel.pdfIn PDF document text
    • http://brownsburgcarwash.com/uploads/1/3/0/7/130775772/ziribe-fugafarewuja-simitoma-tetevesax.pdfIn PDF document text
    • http://shanesheartsofhope.org/uploads/1/3/0/5/130550684/6b946ceb4.pdfIn PDF document text
    • http://foxmaxx.com/uploads/1/3/0/7/130775164/7056677.pdfIn PDF document text
    • http://queyroi.com/uploads/1/3/0/6/130620737/rozuvojiti-mibajujodifa-xopapisiwer.pdfIn PDF document text
    • http://circushive.com/uploads/1/3/0/4/130478484/muwaserariba_domow.pdfIn PDF document text
    • http://pmforan.com/uploads/1/3/0/7/130740116/489772.pdfIn PDF document text
    • http://lasvegasreservestudy.com/uploads/1/3/0/5/130545885/gidiridimexiki.pdfIn PDF document text
    • http://giamdoc.org/uploads/1/3/0/3/130313411/wogovilubanopeb-rodid-buloxesikukag-ruvin.pdfIn PDF document text
    • http://swtexasfireantcontrol.com/uploads/1/3/0/2/130287799/2800ae99b6.pdfIn PDF document text
    • http://ooredoomaldives.net/uploads/1/3/0/6/130604307/kixaboxefaxuxil-fopawigewamitor-xarekilarus.pdfIn PDF document text
    • http://www.californiapureminerals.com/uploads/1/3/0/6/130604597/kaladevimaj.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 3

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_off00008e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5A 10464 bytes
SHA-256: ceccf63b442d70e3e1974dd87088a7019bb88d8ea67c323b0d204939143402cd

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